The U.S. aircraft register, updated daily
Plan a flight · Sun 7:37 pm CDT (00:37 UTC)

Chicago/Rockford International to Oakland San Francisco Bay Airport RFD → OAK

1,538 nautical miles (1,770 statute miles) west on a straight line, true course 271°, about 274° magnetic at the departure end (variation 3W). At 120 knots that is 13 h 22 min at the quickest height in today's winds (4,500 ft, a 5-knot headwind), arriving about 6:59 am PDT (13:59 UTC), after sunset at the destination. Right now RFD is VFR, wind from the southeast (130°) at 3 knots; OAK is VFR, wind from the west-southwest (240°) at 17 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 615 flights in the DOT's last twelve reported months, the route's page.

The return flight

The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words

Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.

Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of

  • SIGMET W68W: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 8:55 pm CDT (01:55 UTC). Near the route, 859 nm along the route.
    as issued
    WSUS33 KKCI 112355
    MKCW WST 112355
    CONVECTIVE SIGMET 68W
    VALID UNTIL 0155Z
    CO NM AZ UT
    FROM 30W CHE-20NNW TBE-60SE ABQ-40N SJN-30SW MTU-30W CHE
    AREA TS MOV FROM 23040KT. TOPS TO FL360.
  • SIGMET W70W: thunderstorms (a convective SIGMET) up to 32,000 ft, moving from the southwest at 40 knots, until 8:55 pm CDT (01:55 UTC). Near the route, 879 nm along the route.
    as issued
    WSUS33 KKCI 112355
    MKCW WST 112355
    CONVECTIVE SIGMET 70W
    VALID UNTIL 0155Z
    MT WY
    FROM 30SSW MLS-60WNW BFF-40SSE OCS-10S BPI-10S BIL-30SSW MLS
    AREA TS MOV FROM 22040KT. TOPS TO FL320.
  • SIGMET W71W: thunderstorms (a convective SIGMET) up to 27,000 ft, moving from the south at 40 knots, until 8:55 pm CDT (01:55 UTC). Over the route from 989 to 1089 nm out.
    as issued
    WSUS33 KKCI 112355
    MKCW WST 112355
    CONVECTIVE SIGMET 71W
    VALID UNTIL 0155Z
    WY UT ID
    FROM 40S DBS-40WNW BPI-30WSW MTU-30SSW DTA-30SE TWF-40S DBS
    AREA EMBD TS MOV FROM 20040KT. TOPS TO FL270.
  • SIGMET W72W: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 20 knots, until 8:55 pm CDT (01:55 UTC). Over the route from 1248 to 1328 nm out.
    as issued
    WSUS33 KKCI 112355
    MKCW WST 112355
    CONVECTIVE SIGMET 72W
    VALID UNTIL 0155Z
    NV
    FROM 60SSW BAM-60W ELY-OAL-40WNW OAL-60SSW BAM
    AREA TS MOV FROM 23020KT. TOPS TO FL300.
  • AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 569 to 1248 nm out.
  • AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 699 to 1089 nm out.
  • AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 769 to 1238 nm out.
  • AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the route from 779 to 1049 nm out.
  • AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 849 to 899 nm out.
  • AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 919 to 1308 nm out.
  • AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the route from 1358 to 1428 nm out.

A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from RFD.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

  • urgent BCS3 at 5,400 ft, 3 nm east, 6:35 pm CDT (23:35 UTC): remarks: wind shear 10 knots gain 1000 above ground on final. 1029 nm along the route, 3 nm east of the line.
    as filed, and in English
    PVU UUA /OV PVU310001/TM 2335/FL054/TP BCS3/RM WIND SHEAR 10 KT GAIN 1000 AGL ON FINAL
    Report
    an urgent report filed through PVU
    Where
    1 nm northwest (310°) of PVU
    Time
    23:35 UTC
    Height
    at 5,400 ft
    Aircraft
    BCS3
    Remarks
    wind shear 10 knots gain 1000 above ground on final
  • A319 at 22,000 ft, 37 nm south, 4:42 pm CDT (21:42 UTC): moderate chop turbulence, remarks: ZDVWC-13. 749 nm along the route, 37 nm south of the line.
    as filed, and in English
    BJC UA /OV BJC322047/TM 2142/FL220/TP A319/TB MOD CHOP/RM ZDVWC-13
    Report
    a routine report filed through BJC
    Where
    47 nm northwest (322°) of BJC
    Time
    21:42 UTC
    Height
    at 22,000 ft
    Aircraft
    A319
    Turbulence
    moderate chop
    Remarks
    ZDVWC-13
  • B39M at 32,000 ft, 49 nm south, 6:58 pm CDT (23:58 UTC): moderate chop turbulence, no icing, remarks: moderate mtw a 30-knot loss of airspeed ZDVWC-14. 789 nm along the route, 49 nm south of the line.
    as filed, and in English
    EEO UA /OV EKR069073/TM 2358/FL320/TP B39M/TB OCNL MOD CHOP/IC NEG/RM MOD MTW +/-30KT ZDVWC-14
    Report
    a routine report filed through EEO
    Where
    73 nm east (069°) of EKR
    Time
    23:58 UTC
    Height
    at 32,000 ft
    Aircraft
    B39M
    Turbulence
    occasional moderate chop
    Icing
    none
    Remarks
    moderate mtw a 30-knot loss of airspeed ZDVWC-14
  • A21N at 33,000 ft, 29 nm south, 5:35 pm CDT (22:35 UTC): moderate turbulence, remarks: mountain wave +25-30KTS. 829 nm along the route, 29 nm south of the line.
    as filed, and in English
    HDN UA /OV CHE/TM 2235/FL330/TP A21N/TB MOD/RM MTN WAVE +25-30KTS
    Report
    a routine report filed through HDN
    Where
    over CHE
    Time
    22:35 UTC
    Height
    at 33,000 ft
    Aircraft
    A21N
    Turbulence
    moderate
    Remarks
    mountain wave +25-30KTS
  • E75L at 12,500 ft, 50 nm north, 5:25 pm CDT (22:25 UTC): moderate turbulence. 1019 nm along the route, 50 nm north of the line.
    as filed, and in English
    HIF UA /OV HIF103005/TM 2225/FL125/TP E75L/TB MOD /ZLC
    Report
    a routine report filed through HIF
    Where
    5 nm east (103°) of HIF
    Time
    22:25 UTC
    Height
    at 12,500 ft
    Aircraft
    E75L
    Turbulence
    moderate zlc
  • PA44 at 6,000 ft, 2 nm east, 6:25 pm CDT (23:25 UTC): moderate turbulence, remarks: runway in sight at at 6,400 ft. 1029 nm along the route, 2 nm east of the line.
    as filed, and in English
    PVU UA /OV PVU310002/TM 2325/FL060/TP PA44/TB MOD /RM RWY IN SIGHT AT 064
    Report
    a routine report filed through PVU
    Where
    2 nm northwest (310°) of PVU
    Time
    23:25 UTC
    Height
    at 6,000 ft
    Aircraft
    PA44
    Turbulence
    moderate
    Remarks
    runway in sight at at 6,400 ft
  • B739 at 11,000 ft, 37 nm north, 5:40 pm CDT (22:40 UTC): moderate turbulence, no icing, -4 °C, wind 180° at 40 knots, remarks: during the descent. 1039 nm along the route, 37 nm north of the line.
    as filed, and in English
    SLC UA /OV TCH240014/TM 2240/FL110/TP B739/TA M04/WV 180040/TB CONT MOD /IC NEG/RM DURD
    Report
    a routine report filed through SLC
    Where
    14 nm southwest (240°) of TCH
    Time
    22:40 UTC
    Height
    at 11,000 ft
    Aircraft
    B739
    Temperature
    −4 °C
    Wind
    from 180° at 40 knots
    Turbulence
    continuous moderate
    Icing
    none
    Remarks
    during the descent
  • A320 at 6,600 ft, 39 nm north, 4:55 pm CDT (21:55 UTC): moderate turbulence, -2 °C, wind 200° at 55 knots, remarks: during the climb from 6,600 ft to 10,000 ft. 1039 nm along the route, 39 nm north of the line.
    as filed, and in English
    SLC UA /OV TCH250007/TM 2155/FL066/TP A320/SK BASE 066 TOPS UNK/TA -2/WV 20055KT/TB OCNL MOD TURB/RM DURC 066-100
    Report
    a routine report filed through SLC
    Where
    7 nm west (250°) of TCH
    Time
    21:55 UTC
    Height
    at 6,600 ft
    Aircraft
    A320
    Sky
    base 6,600 ft tops unknown
    Temperature
    -2
    Wind
    from 200° at 55 knots
    Turbulence
    occasional moderate turbulence
    Remarks
    during the climb from 6,600 ft to 10,000 ft
  • A21N at 34,000 ft, 3 nm northeast, 5:01 pm CDT (22:01 UTC): light chop turbulence. 150 nm along the route, 3 nm northeast of the line.
    as filed, and in English
    ALO UA /OV ALO180020/TM 2201/FL340/TP A21N/TB CONS LGT CHOP
    Report
    a routine report filed through ALO
    Where
    20 nm south (180°) of ALO
    Time
    22:01 UTC
    Height
    at 34,000 ft
    Aircraft
    A21N
    Turbulence
    continuous light chop
  • B739 at 30,000 ft, 15 nm north, 4:38 pm CDT (21:38 UTC): light turbulence. 250 nm along the route, 15 nm north of the line.
    as filed, and in English
    FOD UA /OV FOD220020/TM 2138/FL300/TP B739/TB CONS LGT/ OCNL MOD
    Report
    a routine report filed through FOD
    Where
    20 nm southwest (220°) of FOD
    Time
    21:38 UTC
    Height
    at 30,000 ft
    Aircraft
    B739
    Turbulence
    continuous light occasional moderate
  • A321 at 32,000 ft, 43 nm south, 4:58 pm CDT (21:58 UTC): light chop turbulence, remarks: zdvwc. 529 nm along the route, 43 nm south of the line.
    as filed, and in English
    LBF UA /OV LBF/TM 2158/FL320/TP A321/TB OCNL LGT CHOP/RM ZDVWC
    Report
    a routine report filed through LBF
    Where
    over LBF
    Time
    21:58 UTC
    Height
    at 32,000 ft
    Aircraft
    A321
    Turbulence
    occasional light chop
    Remarks
    zdvwc
  • B763 at 36,000 ft, 10 nm northwest, 5:48 pm CDT (22:48 UTC): no turbulence, remarks: ZDVWC-33. 649 nm along the route, 10 nm northwest of the line.
    as filed, and in English
    BFF UA /OV BFF200020/TM 2248/FL360/TP B763/SK TOP 320-340/TB NEG/RM ZDVWC-33
    Report
    a routine report filed through BFF
    Where
    20 nm south (200°) of BFF
    Time
    22:48 UTC
    Height
    at 36,000 ft
    Aircraft
    B763
    Sky
    top from 32,000 ft to 34,000 ft
    Turbulence
    none
    Remarks
    ZDVWC-33
  • B752 at 35,000 ft, 36 nm north, 6:21 pm CDT (23:21 UTC): light to moderate turbulence, remarks: ZDVWC-33. 699 nm along the route, 36 nm north of the line.
    as filed, and in English
    CYS UA /OV CYS350045/TM 2321/FL350/TP B752/TB CONS LGT-MOD/RM ZDVWC-33
    Report
    a routine report filed through CYS
    Where
    45 nm north (350°) of CYS
    Time
    23:21 UTC
    Height
    at 35,000 ft
    Aircraft
    B752
    Turbulence
    continuous light to moderate
    Remarks
    ZDVWC-33
  • CRJ2 at 29,000 ft, 33 nm north, 5:37 pm CDT (22:37 UTC): light chop turbulence, remarks: ZDVWC-34. 759 nm along the route, 33 nm north of the line.
    as filed, and in English
    CYS UA /OV CYS286065/TM 2237/FL290/TP CRJ2/TB LGT CHOP/RM ZDVWC-34
    Report
    a routine report filed through CYS
    Where
    65 nm west (286°) of CYS
    Time
    22:37 UTC
    Height
    at 29,000 ft
    Aircraft
    CRJ2
    Turbulence
    light chop
    Remarks
    ZDVWC-34

11 more routine reports are on the map.

Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 UTC · at 120 knots true airspeed

The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 13 forecast points nearest it (DBQ, DSM, OMA, ONL, BFF, DEN, RKS, SLC, ELY, BAM, RNO, SAC, SFO). A plus sign is a headwind, a minus sign a tailwind.

HeightAverage windHead- or tailwindTemperatureGround speedTime en routeArrival
4,500 ft200° at 12 kt+5 kt17 °C115 kt13 h 22 min6:59 am PDT (13:59 UTC)
6,500 ft220° at 13 kt+8 kt14 °C112 kt13 h 44 min7:21 am PDT (14:21 UTC)
8,500 ft210° at 21 kt+14 kt10 °C106 kt14 h 31 min8:08 am PDT (15:08 UTC)
10,500 ft220° at 25 kt+19 kt5 °C101 kt15 h 14 min8:51 am PDT (15:51 UTC)
12,500 ft220° at 27 kt+23 kt1 °C97 kt15 h 51 min9:28 am PDT (16:28 UTC)
14,500 ft230° at 28 kt+24 kt-3 °C96 kt16 h 01 min9:38 am PDT (16:38 UTC)
16,500 ft230° at 30 kt+25 kt-7 °C95 kt16 h 11 min9:48 am PDT (16:48 UTC)
18,000 ft FL180230° at 31 kt+26 kt-10 °C94 kt16 h 22 min9:59 am PDT (16:59 UTC)
24,000 ft FL240230° at 36 kt+32 kt-22 °C88 kt17 h 29 min11:06 am PDT (18:06 UTC)
30,000 ft FL300240° at 44 kt+42 kt-32 °C78 kt19 h 43 min1:20 pm PDT (20:20 UTC)
34,000 ft FL340240° at 52 kt+51 kt-38 °C69 kt22 h 17 min3:54 pm PDT (22:54 UTC)
39,000 ft FL390250° at 57 kt+58 kt-47 °C62 kt24 h 48 min6:25 pm PDT (01:25 UTC)

Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.

The forecast points as issued
PointFrom3,0006,0009,00012,00018,00024,00030,00034,00039,000
DBQused from 0 nm out; 48 nm from the line220/23240/22 16°240/24 10°260/18 5°270/16 -8°290/27 -19°310/42 -35°320/55 -44°300/71 -52°
DSMused from 150 nm out; 48 nm from the line200/32240/27 17°260/19 10°260/16 5°260/19 -7°240/22 -19°270/20 -32°270/38 -42°290/58 -53°
OMAused from 250 nm out; 56 nm from the line190/34230/34 19°250/25 12°250/18 6°250/22 -7°250/28 -19°260/34 -32°260/39 -41°280/56 -51°
ONLused from 350 nm out; 60 nm from the line200/20 17°230/26 14°240/21 7°250/27 -9°260/32 -19°240/44 -34°240/56 -41°250/62 -51°
BFFused from 549 nm out; 75 nm from the line120/24180/31 13°210/26 7°230/25 -7°240/41 -20°230/52 -36°250/56 -41°260/57 -45°
DENused from 749 nm out; 108 nm from the line190/31 16°210/32 7°240/41 -8°230/47 -21°240/56 -32°250/65 -37°250/61 -47°
RKSused from 799 nm out; 83 nm from the line190/43210/65 3°210/57 -9°210/56 -21°210/47 -33°230/63 -37°240/77 -46°
SLCused from 949 nm out; 65 nm from the line280/8210/39 5°210/52 -1°200/50 -11°200/56 -23°220/61 -28°230/73 -37°230/73 -45°
ELYused from 1099 nm out; 59 nm from the line210/20 4°240/21 -1°230/37 -13°200/58 -25°220/73 -27°220/73 -36°220/69 -44°
BAMused from 1248 nm out; 87 nm from the line270/8 4°230/27 -4°220/49 -18°210/52 -26°220/77 -29°220/71 -33°220/63 -43°
RNOused from 1298 nm out; 93 nm from the line320/7260/13 1°230/21 -7°210/38 -17°220/43 -26°230/54 -29°230/59 -32°230/54 -41°
SACused from 1448 nm out; 36 nm from the line270/5L/V 5°L/V -1°240/11 -5°250/22 -15°270/25 -24°260/31 -27°240/39 -33°240/39 -42°
SFOused from 1498 nm out; 29 nm from the line220/11L/V 5°280/7 1°270/15 -3°290/23 -14°310/29 -24°280/26 -28°250/30 -34°250/36 -43°

The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch

AirportWhereConditionsWindVisibilityCeilingElevationReported
RFD Chicago/Rockford, IL departure VFR Sky: a few clouds at 25,000 feet from the southeast (130°) at 3 knots 10+ mi none 742 ft 6:54 pm CDT (23:54 UTC)
DBQ Dubuque, IA 70 nm out, 12 nm north of the line, tower VFR from the south-southeast (160°) at 8 knots 10+ mi none 1,076 ft 23:53 UTC
MIW Marshalltown, IA 170 nm out, 4 nm south of the line VFR from the south (170°) at 8 knots 10+ mi none 974 ft 23:53 UTC
SUX Sioux City, IA 320 nm out, 20 nm north of the line, tower VFR from the south-southwest (210°) at 7 knots 10+ mi none 1,098 ft 23:52 UTC
TIF Thedford, NE 509 nm out, 11 nm north of the line VFR from the east-northeast (060°) at 4 knots 10+ mi none 2,925 ft 00:15 UTC
CYS Cheyenne, WY 709 nm out, 11 nm southeast of the line, tower VFR from the east-southeast (110°) at 9 knots 10+ mi none 6,159 ft 23:53 UTC
DWX Dixon, WY 829 nm out, 4 nm north of the line VFR Sky: scattered clouds at 10,000 feet, scattered clouds at 12,000 feet from the south-southeast (150°) at 12 knots, gusting to 20 10+ mi none 6,548 ft 00:15 UTC
PVU Provo, UT 1029 nm out, 4 nm southeast of the line, tower VFR Sky: a broken layer at 5,500 feet, overcast at 7,000 feet Weather: light rain from the south-southwest (210°) at 14 knots 10+ mi 5,500 ft 4,496 ft 23:56 UTC
ELY Ely, NV 1178 nm out, 19 nm south of the line VFR from the south (190°) at 8 knots 10+ mi none 6,259 ft 23:53 UTC
GAB Gabbs, NV 1328 nm out, 4 nm northeast of the line no report just now 4,699 ft
SCK Stockton, CA 1488 nm out, 7 nm south of the line, tower VFR calm 10+ mi none 32 ft 23:55 UTC
OAK Oakland, CA destination VFR Sky: a few clouds at 2,000 feet, a few clouds at 4,500 feet from the west-southwest (240°) at 17 knots 10+ mi none 9 ft 4:53 pm PDT (23:53 UTC)

The highest airport on this list sits at 6,548 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At OAK when you get there the forecast at the estimated arrival, 6:59 am PDT (13:59 UTC)

Wind from the east-southeast at 5 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for OAK
  • From Sun 5:00 pm PDT (00:00 UTC): wind from the west-southwest at 12 knots, visibility more than 6 miles, a few clouds at 2,000 feet
  • From Sun 7:00 pm PDT (02:00 UTC): wind from the west-southwest at 8 knots, visibility more than 6 miles, a few clouds at 2,000 feet
  • From Sun 11:00 pm PDT (06:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, clear skies
  • From Mon 3:00 pm PDT (22:00 UTC): wind from the west at 10 knots, visibility more than 6 miles, clear skies
The forecast for RFD, the departure
  • From Sun 7:00 pm CDT (00:00 UTC): wind from the south at 5 knots, visibility more than 6 miles, clear skies
  • From Mon 12:00 pm CDT (17:00 UTC): wind from the south-southwest at 12 knots, gusting to 22, visibility more than 6 miles, scattered clouds at 20,000 feet
  • From Mon 6:00 pm CDT (23:00 UTC): wind from the south-southwest at 12 knots, visibility more than 6 miles, a few clouds at 12,000 feet

Temporary flight restrictions on the line or within 25 nm of it

  • 6/6740 SACRAMENTO, CA, Thursday, October 8, 2026 through Sunday, October 11, 2026 Local 25 nm from the route, at the destination end · air shows/sports · ended 11 October · ZOA
  • 6/7231 Santa Clara, CA, Sunday, October 11, 2026 through Monday, October 12, 2026 UTC 22 nm from the route, at the destination end · drones kept away from a public gathering · until 12 October · ZOA
  • 6/7455 SAN FRANCISCO, CA, Thursday, October 8, 2026 through Sunday, October 11, 2026 Local 8 nm from the route, at the destination end · security · ended 11 October · ZOA

Daylight

Sunset at RFD 6:19 pm CDT (23:19 UTC), at OAK 6:35 pm PDT (01:35 UTC) (civil twilight ends 7:02 pm PDT (02:02 UTC)). At 120 knots the arrival at OAK is before sunrise there (7:14 am PDT (14:14 UTC)).

Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.

Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads

Radar now, the upper Mississippi valley
Radar now, the upper Mississippi valley · loop National Weather Service
Radar now, the northern Rockies
Radar now, the northern Rockies · loop National Weather Service
Radar now, the southern Rockies
Radar now, the southern Rockies · loop National Weather Service
Radar, the whole country
Radar, the whole country · loop National Weather Service
Surface analysis now
Surface analysis now Weather Prediction Center
Forecast chart, 12 hours ahead
Forecast chart, 12 hours ahead Weather Prediction Center
Forecast chart, 24 hours ahead
Forecast chart, 24 hours ahead Weather Prediction Center

Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: Chicago/Rockford International, Oakland San Francisco Bay Airport.