Plan a flight · Sun 6:41 pm PDT (01:41 UTC)

San Francisco International to Joe Foss Field SFO → FSD

1,217 nautical miles (1,400 statute miles) northeast on a straight line, true course 065°, about 051° magnetic at the departure end (variation 14E). At 120 knots that is 6 h 48 min at the quickest height in today's winds (39,000 ft, a 59-knot tailwind), arriving about 3:29 am CDT (08:29 UTC), after sunset at the destination. Right now SFO is VFR, wind from the west-southwest (240°) at 13 knots; FSD is VFR, wind from the west-northwest (290°) at 5 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: 2 flights in the DOT's last twelve reported months, the route's page.

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 5W: thunderstorms (a convective SIGMET) up to 33,000 ft, moving from the southwest at 20 knots, until 7:55 pm PDT (02:55 UTC). Over the route from 239 to 379 nm out.

as issued

WSUS33 KKCI 120055
MKCW WST 120055
CONVECTIVE SIGMET 5W
VALID UNTIL 0255Z
NV
FROM 10NNE BAM-40WSW BVL-60SW ELY-10SE OAL-30WNW OAL-10NNE BAM
AREA TS MOV FROM 23020KT. TOPS TO FL330.

SIGMET 3W: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 40 knots, until 7:55 pm PDT (02:55 UTC). Over the route from 758 to 828 nm out.
as issued
```
WSUS33 KKCI 120055
MKCW WST 120055
CONVECTIVE SIGMET 3W
VALID UNTIL 0255Z
MT WY
FROM 10WSW MLS-70E DDY-20N LAR-50E BPI-30NE BIL-10WSW MLS
AREA TS MOV FROM 22040KT. TOPS TO FL310.
```
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 50 nm of the route.
AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the route from 130 to 160 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 199 to 728 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 209 to 957 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 269 to 728 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 349 to 878 nm out.
AIRMET SIERRA 2E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 529 to 529 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 598 to 828 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 648 to 728 nm out.
AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Near the route, 997 nm along the route.

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 SFO.

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

urgent BCS3 at 5,400 ft, 40 nm south, 4:35 pm PDT (23:35 UTC): remarks: wind shear 10 knots gain 1000 above ground on final. 519 nm along the route, 40 nm south 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
urgent CRJ2 at 7,000 ft, 47 nm north, 6:04 pm PDT (01:04 UTC): moderate turbulence, remarks: low-level wind shear dept RY03 gain/loss unknown. 798 nm along the route, 47 nm north of the line.
as filed, and in English
```
CPR UUA /OV CPR035002/TM 0104/FL070/TP CRJ2/TB CONT MOD TURB/RM LLWS DEPT RY03 GAIN/LOSS UNKN
```
Report
an urgent report filed through CPR
Where
2 nm northeast (035°) of CPR
Time
01:04 UTC
Height
at 7,000 ft
Aircraft
CRJ2
Turbulence
continuous moderate turbulence
Remarks
low-level wind shear dept RY03 gain/loss unknown
PA44 at 6,000 ft, 39 nm south, 4:25 pm PDT (23:25 UTC): moderate turbulence, remarks: runway in sight at at 6,400 ft. 519 nm along the route, 39 nm south 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
E75L at 14,500 ft, 18 nm north, 4:05 pm PDT (23:05 UTC): moderate turbulence up to 15,800 ft, heavy rain, remarks: during the climb zlc. 529 nm along the route, 18 nm north of the line.
as filed, and in English
```
OGD UA /OV OGD086008/TM 2305/FL145/TP E75L/WX +RA/TB MOD 158 BLO/RM DURC /ZLC
```
Report
a routine report filed through OGD
Where
8 nm east (086°) of OGD
Time
23:05 UTC
Height
at 14,500 ft
Aircraft
E75L
Weather
heavy rain
Turbulence
moderate at 15,800 ft below
Remarks
during the climb zlc
A339 at 16,000 ft, 21 nm northwest, 4:35 pm PDT (23:35 UTC): moderate chop turbulence up to 16,000 ft, remarks: during the climb zlc. 538 nm along the route, 21 nm northwest of the line.
as filed, and in English
```
OGD UA /OV OGD063012/TM 2335/FL160/TP A339/TB MOD CHOP 160 BLO/RM DURC /ZLC
```
Report
a routine report filed through OGD
Where
12 nm northeast (063°) of OGD
Time
23:35 UTC
Height
at 16,000 ft
Aircraft
A339
Turbulence
moderate chop at 16,000 ft below
Remarks
during the climb zlc
BE9L at 21,000 ft, 5 nm north, 4:22 pm PDT (23:22 UTC): light chop turbulence above 21,000 ft, moderate icing above 21,000 ft, -21 °C, remarks: zdvwc. 828 nm along the route, 5 nm north of the line.
as filed, and in English
```
DGW UA /OV IIP200020/TM 2322/FL210/TP BE9L/SK BASE 200/TA M21/TB OCNL LGT CHOP 210/IC MOD MIX 210/RM ZDVWC
```
Report
a routine report filed through DGW
Where
20 nm south (200°) of IIP
Time
23:22 UTC
Height
at 21,000 ft
Aircraft
BE9L
Sky
base 20,000 ft
Temperature
−21 °C
Turbulence
occasional light chop at 21,000 ft
Icing
moderate mix at 21,000 ft
Remarks
zdvwc
B38M descending, 44 nm north, 6:28 pm PDT (01:28 UTC): light chop turbulence, remarks: during the descent RY35L rno. 150 nm along the route, 44 nm north of the line.
as filed, and in English
```
RNO UA /OV KRNO167009/TM 0128/FLUNKN/TP B38M/TB OCNL LGT CHOP/RM DURD RY35L RNO
```
Report
a routine report filed through RNO
Where
9 nm south (167°) of KRNO
Time
01:28 UTC
Height
height not given
Aircraft
B38M
Turbulence
occasional light chop
Remarks
during the descent RY35L rno
B737 at 16,000 ft, 3 nm southeast, 5:45 pm PDT (00:45 UTC): no turbulence, light rime icing from 13,000 ft to 17,000 ft, 8 °C, remarks: during the climb. 499 nm along the route, 3 nm southeast of the line.
as filed, and in English
```
SLC UA /OV TCH230020/TM 0045/FL160/TP B737/TA 8/TB NEG/IC LT RIME 130-170/RM DURC
```
Report
a routine report filed through SLC
Where
20 nm southwest (230°) of TCH
Time
00:45 UTC
Height
at 16,000 ft
Aircraft
B737
Temperature
8 °C
Turbulence
none
Icing
lt rime from 13,000 ft to 17,000 ft
Remarks
during the climb
B38M at 16,000 ft, 4 nm southwest, 5:06 pm PDT (00:06 UTC): no turbulence, no icing, 13 °C, remarks: during the climb. 509 nm along the route, 4 nm southwest of the line.
as filed, and in English
```
SLC UA /OV TCH230015/TM 0006/FL160/TP B38M/TA 13/TB NEG/IC NEG/RM DURC
```
Report
a routine report filed through SLC
Where
15 nm southwest (230°) of TCH
Time
00:06 UTC
Height
at 16,000 ft
Aircraft
B38M
Temperature
13 °C
Turbulence
none
Icing
none
Remarks
during the climb
A321 at 10,000 ft, 20 nm south, 5:00 pm PDT (00:00 UTC): light chop turbulence, no icing, remarks: during the descent. 519 nm along the route, 20 nm south of the line.
as filed, and in English
```
SLC UA /OV TCH165020/TM 0000/FL100/TP A321/TB LGT CHOP/IC NEG/RM DURD
```
Report
a routine report filed through SLC
Where
20 nm south (165°) of TCH
Time
00:00 UTC
Height
at 10,000 ft
Aircraft
A321
Turbulence
light chop
Icing
none
Remarks
during the descent
BCS1 at 12,500 ft, 13 nm northwest, 4:09 pm PDT (23:09 UTC): light to moderate turbulence, remarks: during the climb from 8,000 ft to 12,500 ft. 529 nm along the route, 13 nm northwest of the line.
as filed, and in English
```
SLC UA /OV TCH350015/TM 2309/FL125/TP BCS1/TB LGT TO MOD TURB/RM DURC 080-125
```
Report
a routine report filed through SLC
Where
15 nm north (350°) of TCH
Time
23:09 UTC
Height
at 12,500 ft
Aircraft
BCS1
Turbulence
light to moderate turbulence
Remarks
during the climb from 8,000 ft to 12,500 ft
UAL2395 at 37,000 ft, 4 nm northeast, 5:58 pm PDT (00:58 UTC): no turbulence, wind 240° at 70 knots. 658 nm along the route, 4 nm northeast of the line.
as filed, and in English
```
ARP UAL2395 4135N 10900W 0058 F370 240/070KT TB NONE SK CLEAR IC NONE
```
Report
a routine report filed through ARP
CRJ2 at 9,000 ft, 39 nm north, 5:35 pm PDT (00:35 UTC): light chop turbulence, vmc, remarks: occasional moderate turbulence at at 15,000 ft. 778 nm along the route, 39 nm north of the line.
as filed, and in English
```
CPR UA /OV CPR215015/TM 0035/FL090/TP CRJ2/WX VMC/TB LGT CHOP/RM OCNL MOD TURB AT 150
```
Report
a routine report filed through CPR
Where
15 nm southwest (215°) of CPR
Time
00:35 UTC
Height
at 9,000 ft
Aircraft
CRJ2
Weather
visual conditions
Turbulence
light chop
Remarks
occasional moderate turbulence at at 15,000 ft
B752 at 35,000 ft, 29 nm south, 4:21 pm PDT (23:21 UTC): light to moderate turbulence, remarks: ZDVWC-33. 858 nm along the route, 29 nm south 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

2 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 eastbound cruising heights for this course (VFR: odd 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 (SFO, SAC, RNO, BAM, ELY, SLC, RKS, LND, BFF, RAP, PIR, ONL, FSD). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
5,500 ft	180° at 5 kt	0	16 °C	120 kt	10 h 08 min	6:49 am CDT (11:49 UTC)
7,500 ft	200° at 17 kt	−10 kt	9 °C	130 kt	9 h 22 min	6:03 am CDT (11:03 UTC)
9,500 ft	210° at 24 kt	−17 kt	6 °C	137 kt	8 h 53 min	5:34 am CDT (10:34 UTC)
11,500 ft	220° at 29 kt	−23 kt	2 °C	143 kt	8 h 31 min	5:12 am CDT (10:12 UTC)
13,500 ft	220° at 32 kt	−26 kt	-2 °C	146 kt	8 h 20 min	5:01 am CDT (10:01 UTC)
15,500 ft	220° at 34 kt	−28 kt	-6 °C	148 kt	8 h 13 min	4:54 am CDT (09:54 UTC)
17,500 ft	220° at 36 kt	−30 kt	-10 °C	150 kt	8 h 07 min	4:48 am CDT (09:48 UTC)
18,000 ft FL180	220° at 36 kt	−31 kt	-11 °C	151 kt	8 h 04 min	4:45 am CDT (09:45 UTC)
24,000 ft FL240	220° at 41 kt	−35 kt	-22 °C	155 kt	7 h 51 min	4:32 am CDT (09:32 UTC)
30,000 ft FL300	230° at 51 kt	−46 kt	-31 °C	166 kt	7 h 20 min	4:01 am CDT (09:01 UTC)
34,000 ft FL340	230° at 59 kt	−56 kt	-37 °C	176 kt	6 h 55 min	3:36 am CDT (08:36 UTC)
39,000 ft FL390	240° at 60 kt	−59 kt	-46 °C	179 kt	6 h 48 min	3:29 am CDT (08:29 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

Point	From	3,000	6,000	9,000	12,000	18,000	24,000	30,000	34,000	39,000
SFO	used from 0 nm out; 25 nm from the line	220/11	L/V 5°	280/7 1°	270/15 -3°	290/23 -14°	310/29 -24°	280/26 -28°	250/30 -34°	250/36 -43°
SAC	used from 50 nm out; 34 nm from the line	270/5	L/V 5°	L/V -1°	240/11 -5°	250/22 -15°	270/25 -24°	260/31 -27°	240/39 -33°	240/39 -42°
RNO	used from 100 nm out; 62 nm from the line		320/7	260/13 1°	230/21 -7°	210/38 -17°	220/43 -26°	230/54 -29°	230/59 -32°	230/54 -41°
BAM	used from 249 nm out; 70 nm from the line			270/8 4°	230/27 -4°	220/49 -18°	210/52 -26°	220/77 -29°	220/71 -33°	220/63 -43°
ELY	used from 299 nm out; 61 nm from the line			210/20 4°	240/21 -1°	230/37 -13°	200/58 -25°	220/73 -27°	220/73 -36°	220/69 -44°
SLC	used from 449 nm out; 46 nm from the line		280/8	210/39 5°	210/52 -1°	200/50 -11°	200/56 -23°	220/61 -28°	230/73 -37°	230/73 -45°
RKS	used from 598 nm out; 36 nm from the line			190/43	210/65 3°	210/57 -9°	210/56 -21°	210/47 -33°	230/63 -37°	240/77 -46°
LND	used from 748 nm out; 104 nm from the line			180/33 10°	190/50 3°	210/59 -9°	200/50 -21°	190/41 -34°	230/55 -39°	240/65 -47°
BFF	used from 798 nm out; 90 nm from the line		120/24	180/31 13°	210/26 7°	230/25 -7°	240/41 -20°	230/52 -36°	250/56 -41°	260/57 -45°
RAP	used from 947 nm out; 80 nm from the line		120/15 12°	180/22 11°	220/26 5°	230/35 -9°	240/40 -22°	240/50 -37°	240/51 -41°	240/47 -47°
PIR	used from 997 nm out; 89 nm from the line		L/V 17°	230/13 12°	220/22 6°	250/31 -9°	250/34 -21°	240/50 -35°	230/61 -43°	240/62 -51°
ONL	used from 1047 nm out; 72 nm from the line		200/20 17°	230/26 14°	240/21 7°	250/27 -9°	260/32 -19°	240/44 -34°	240/56 -41°	250/62 -51°
FSD	used from 1147 nm out; 45 nm from the line	200/16	220/20 17°	240/26 13°	230/19 6°	240/25 -9°	240/28 -20°	250/39 -33°	250/44 -43°	260/63 -52°

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

Airport	Where	Conditions	Wind	Visibility	Ceiling	Elevation	Reported
SFO San Francisco, CA	departure	VFR Sky: a few clouds at 2,000 feet, a few clouds at 5,000 feet	from the west-southwest (240°) at 13 knots	10+ mi	none	13 ft	5:56 pm PDT (00:56 UTC)
LVK Livermore, CA	30 nm out, 8 nm south of the line, tower	VFR Sky: scattered clouds at 7,500 feet	from the west-northwest (290°) at 11 knots	10+ mi	none	399 ft	00:53 UTC
GAB Gabbs, NV	219 nm out, 13 nm southeast of the line	no report just now				4,699 ft
TMT Austin, NV	269 nm out, 5 nm northwest of the line	VFR Sky: scattered clouds at 5,500 feet, scattered clouds at 7,000 feet, overcast at 9,000 feet	from the northeast (050°) at 5 knots	10+ mi	9,000 ft	5,735 ft	01:15 UTC
ENV Wendover, UT	429 nm out, 23 nm north of the line	VFR Sky: scattered clouds at 11,000 feet	from the east-southeast (110°) at 5 knots	10+ mi	none	4,236 ft	00:56 UTC
SLC Salt Lake City, UT	519 nm out, 4 nm southeast of the line, tower	VFR Sky: a few clouds at 800 feet, scattered clouds at 1,700 feet, overcast at 5,000 feet Weather: rain, mist	from the east-northeast (070°) at 3 knots	6 mi	5,000 ft	4,230 ft	01:11 UTC
RKS Rock Springs, WY	658 nm out, 2 nm north of the line	VFR	from the south (190°) at 17 knots, gusting to 24	10+ mi	none	6,764 ft	00:54 UTC
RWL Rawlins, WY	748 nm out, 10 nm south of the line	VFR	from the south (180°) at 5 knots	10+ mi	none	6,816 ft	13:53 UTC
GUR Guernsey, WY	858 nm out, 11 nm south of the line, tower	VFR Sky: a few clouds at 14,000 feet, scattered clouds at 24,000 feet	from the east (090°) at 11 knots	10+ mi	none	4,401 ft	00:55 UTC
GRN Gordon, NE	977 nm out, 5 nm southwest of the line	VFR	from the east-northeast (060°) at 11 knots	10+ mi	none	3,562 ft	01:35 UTC
AGZ Wagner, SD	1147 nm out, 20 nm south of the line	VFR	from the northwest (320°) at 8 knots	10+ mi	none	1,477 ft	01:15 UTC
FSD Sioux Falls, SD	destination	VFR Sky: scattered clouds at 18,000 feet, scattered clouds at 25,000 feet	from the west-northwest (290°) at 5 knots	10+ mi	none	1,430 ft	7:56 pm CDT (00:56 UTC)

The highest airport on this list sits at 6,816 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At FSD when you get there the forecast at the estimated arrival, 3:29 am CDT (08:29 UTC)

Wind light and variable, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for FSD

From Sun 7:00 pm CDT (00:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, a broken layer at 25,000 feet
From Sun 9:00 pm CDT (02:00 UTC): wind from the west-northwest at 6 knots, visibility more than 6 miles, a broken layer at 25,000 feet
From Sun 11:00 pm CDT (04:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 8:00 am CDT (13:00 UTC): wind from the northeast at 6 knots, visibility more than 6 miles, scattered clouds at 700 feet
From Mon 2:00 pm CDT (19:00 UTC): wind from the west-southwest at 8 knots, visibility more than 6 miles, a few clouds at 25,000 feet
From Mon 4:00 pm CDT (21:00 UTC): wind from the west at 11 knots, gusting to 17, visibility more than 6 miles, a few clouds at 25,000 feet

The forecast for SFO, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the west-southwest at 16 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 Mon 1:00 am PDT (08:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, clear skies
From Mon 11:00 am PDT (18:00 UTC): wind from the east-northeast 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

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

6/7231 Santa Clara, CA, Sunday, October 11, 2026 through Monday, October 12, 2026 UTC 19 nm from the route, at the departure end · drones kept away from a public gathering · until 12 October · ZOA
6/6740 SACRAMENTO, CA, Thursday, October 8, 2026 through Sunday, October 11, 2026 Local 23 nm from the route, 70 nm along the route · air shows/sports · ended 11 October · ZOA

Daylight

Sunset at SFO 6:36 pm PDT (01:36 UTC), at FSD 6:49 pm CDT (23:49 UTC) (civil twilight ends 7:17 pm CDT (00:17 UTC)). At 120 knots the arrival at FSD is before sunrise there (7:37 am CDT (12:37 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 Pacific Southwest · loop National Weather Service

Radar now, the southern Rockies · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

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: San Francisco International, Joe Foss Field.