Plan a flight · Sun 6:38 pm PDT (01:38 UTC)

Seattle-Tacoma International to General Edward Lawrence Logan International SEA → BOS

2,163 nautical miles (2,489 statute miles) east on a straight line, true course 079°, about 063° magnetic at the departure end (variation 16E). At 120 knots that is 12 h 26 min at the quickest height in today's winds (39,000 ft, a 54-knot tailwind), arriving about 10:04 am EDT (14:04 UTC). Right now SEA is VFR, wind from the north (350°) at 11 knots; BOS is marginal VFR, wind from the east (080°) at 8 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: 4,924 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

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 169 nm of the route.
AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 120 to 518 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 269 to 758 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 269 to 399 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). Over the route from 349 to 787 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). Over the route from 917 to 1166 nm out.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 249 nm of the route.
AIRMET ZULU 1C: moderate icing up to 22,000 ft. Over the last 229 nm of the route.
AIRMET TANGO 2W: moderate turbulence below 18,000 ft up to 13,000 ft. Over the last 219 nm of the route.
AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 209 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1954 to 2093 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 SEA.

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

E75 at 34,000 ft, 41 nm southwest, 4:15 pm PDT (23:15 UTC): moderate turbulence. 1983 nm along the route, 41 nm southwest of the line.
as filed, and in English
```
RME UA /OV UCA/TM 2315/FL340/TP E75/TB CONS MOD
```
Report
a routine report filed through RME
Where
over UCA
Time
23:15 UTC
Height
at 34,000 ft
Aircraft
E75
Turbulence
continuous moderate
A21N at 35,000 ft, 41 nm southwest, 3:57 pm PDT (22:57 UTC): moderate turbulence. 1983 nm along the route, 41 nm southwest of the line.
as filed, and in English
```
RME UA /OV UCA/TM 2257/FL350/TP A21N/TB CONS MOD
```
Report
a routine report filed through RME
Where
over UCA
Time
22:57 UTC
Height
at 35,000 ft
Aircraft
A21N
Turbulence
continuous moderate
CRJ7 at 20,000 ft, 6 nm north, 5:50 pm PDT (00:50 UTC): moderate turbulence. 2043 nm along the route, 6 nm north of the line.
as filed, and in English
```
ALB UA /OV CAM360020/TM 0050/FL200/TP CRJ7/TB MOD
```
Report
a routine report filed through ALB
Where
20 nm north (360°) of CAM
Time
00:50 UTC
Height
at 20,000 ft
Aircraft
CRJ7
Turbulence
moderate
GLEX at 26,000 ft, 10 nm southwest, 4:54 pm PDT (23:54 UTC): moderate clear-air turbulence. 2053 nm along the route, 10 nm southwest of the line.
as filed, and in English
```
ALB UA /OV CAM/TM 2354/FL260/TP GLEX/TB MOD CAT 260-230 LGT MOD CAT BLO 230
```
Report
a routine report filed through ALB
Where
over CAM
Time
23:54 UTC
Height
at 26,000 ft
Aircraft
GLEX
Turbulence
moderate clear-air turbulence from 26,000 ft to 23,000 ft light moderate clear-air turbulence below 23,000 ft
GLF4 at 10,000 ft, 29 nm southwest, 6:03 pm PDT (01:03 UTC): moderate turbulence above 10,000 ft, light rain, remarks: instrument conditions. At the destination end, 29 nm southwest of the line.
as filed, and in English
```
BDL UA /OV CEF060010/TM 0103/FL100/TP GLF4/WX -RA/TB MOD 100/RM IMC
```
Report
a routine report filed through BDL
Where
10 nm northeast (060°) of CEF
Time
01:03 UTC
Height
at 10,000 ft
Aircraft
GLF4
Weather
light rain
Turbulence
moderate at 10,000 ft
Remarks
instrument conditions
E75S at 16,000 ft, 36 nm southwest, 4:35 pm PDT (23:35 UTC): moderate clear-air turbulence above 16,000 ft, remarks: moderate in +ra to light chop. At the destination end, 36 nm southwest of the line.
as filed, and in English
```
SFZ UA /OV PUT360003/TM 2335/FL160/TP E75S/TB MOD 160 CAT/RM MOD IN +RA TO LGT CHOP
```
Report
a routine report filed through SFZ
Where
3 nm north (360°) of PUT
Time
23:35 UTC
Height
at 16,000 ft
Aircraft
E75S
Turbulence
moderate at 16,000 ft clear-air turbulence
Remarks
moderate in +ra to light chop
A321 at 5,000 ft, 21 nm southeast, 5:46 pm PDT (00:46 UTC): moderate turbulence from 5,000 ft to 15,000 ft. At the destination end, 21 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS150020/TM 0046/FL050/TP A321/TB MOD 150-050
```
Report
a routine report filed through BOS
Where
20 nm southeast (150°) of BOS
Time
00:46 UTC
Height
at 5,000 ft
Aircraft
A321
Turbulence
moderate from 15,000 ft to 5,000 ft
BCS3 at 18,000 ft, 41 nm south, 5:17 pm PDT (00:17 UTC): moderate chop turbulence, remarks: moderate CHOP180-210 smooth above 22,000 ft. At the destination end, 41 nm south of the line.
as filed, and in English
```
EWB UA /OV EWB/TM 0017/FL180/TP BCS3/TB MOD CHOP/RM MOD CHOP180-210 SMOOTH ABOVE FL220
```
Report
a routine report filed through EWB
Where
over EWB
Time
00:17 UTC
Height
at 18,000 ft
Aircraft
BCS3
Turbulence
moderate chop
Remarks
moderate CHOP180-210 smooth above 22,000 ft
BCS3 at 12,000 ft, 20 nm south, 5:11 pm PDT (00:11 UTC): moderate turbulence, rain, remarks: ssoxs dept from 12,000 ft to 16,000 ft. At the destination end, 20 nm south of the line.
as filed, and in English
```
BOS UA /OV BOS200020/TM 0011/FL120/TP BCS3/WX RA+/TB MOD/RM SSOXS DEPT 120-160
```
Report
a routine report filed through BOS
Where
20 nm south (200°) of BOS
Time
00:11 UTC
Height
at 12,000 ft
Aircraft
BCS3
Weather
ra+
Turbulence
moderate
Remarks
ssoxs dept from 12,000 ft to 16,000 ft
BCS3 at 13,000 ft, 1 nm southeast, 4:03 pm PDT (23:03 UTC): moderate turbulence from 13,000 ft to 16,000 ft, heavy rain, remarks: during the climb. At the destination end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS18005/TM 2303/FL130/TP BCS3/WX +RA/TB MOD 130-160/RM DURC
```
Report
a routine report filed through BOS
Where
BOS18005
Time
23:03 UTC
Height
at 13,000 ft
Aircraft
BCS3
Weather
heavy rain
Turbulence
moderate from 13,000 ft to 16,000 ft
Remarks
during the climb
PC12 at 15,000 ft, 40 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 40 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL150/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 15,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
PC12 at 13,000 ft, 40 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 40 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL130/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 13,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
E75L descending, 4 nm north, 6:06 pm PDT (01:06 UTC): overcast above 4,000 ft. 329 nm along the route, 4 nm north of the line.
as filed, and in English
```
GPI UA /OV KGPI/TM 0106/FLDURD/TP E75L/SK OVC040
```
Report
a routine report filed through GPI
Where
over KGPI
Time
01:06 UTC
Height
during the descent
Aircraft
E75L
Sky
overcast from 4,000 ft
PA24 at 6,000 ft, 8 nm northwest, 5:48 pm PDT (00:48 UTC): light rime icing from 5,000 ft to 6,000 ft, 2 °C. 787 nm along the route, 8 nm northwest of the line.
as filed, and in English
```
XWA UA /OV XWA060040/TM 0048/FL060/TP PA24/TA 02/IC LGT RIME 060-050
```
Report
a routine report filed through XWA
Where
40 nm northeast (060°) of XWA
Time
00:48 UTC
Height
at 6,000 ft
Aircraft
PA24
Temperature
2 °C
Icing
light rime from 6,000 ft to 5,000 ft

16 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 16 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, MOT, GFK, INL, DLH, GRB, TVC, BUF, SYR, ALB, BOS). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
3,500 ft	180° at 8 kt	+4 kt		116 kt	18 h 39 min	4:17 pm EDT (20:17 UTC)
5,500 ft	110° at 2 kt	+4 kt	1 °C	116 kt	18 h 39 min	4:17 pm EDT (20:17 UTC)
7,500 ft	240° at 1 kt	0	5 °C	120 kt	18 h 02 min	3:40 pm EDT (19:40 UTC)
9,500 ft	250° at 5 kt	−3 kt	2 °C	123 kt	17 h 35 min	3:13 pm EDT (19:13 UTC)
11,500 ft	240° at 9 kt	−7 kt	-1 °C	127 kt	17 h 02 min	2:40 pm EDT (18:40 UTC)
13,500 ft	240° at 13 kt	−10 kt	-4 °C	130 kt	16 h 38 min	2:16 pm EDT (18:16 UTC)
15,500 ft	240° at 16 kt	−14 kt	-8 °C	134 kt	16 h 09 min	1:47 pm EDT (17:47 UTC)
17,500 ft	240° at 20 kt	−17 kt	-12 °C	137 kt	15 h 47 min	1:25 pm EDT (17:25 UTC)
18,000 ft FL180	240° at 21 kt	−18 kt	-13 °C	138 kt	15 h 40 min	1:18 pm EDT (17:18 UTC)
24,000 ft FL240	250° at 31 kt	−27 kt	-23 °C	147 kt	14 h 43 min	12:21 pm EDT (16:21 UTC)
30,000 ft FL300	250° at 46 kt	−40 kt	-37 °C	160 kt	13 h 31 min	11:09 am EDT (15:09 UTC)
34,000 ft FL340	250° at 53 kt	−48 kt	-45 °C	168 kt	12 h 52 min	10:30 am EDT (14:30 UTC)
39,000 ft FL390	260° at 60 kt	−54 kt	-50 °C	174 kt	12 h 26 min	10:04 am EDT (14:04 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
SEA	used from 0 nm out; 25 nm from the line	360/9	350/10 1°	010/10 -5°	030/20 -11°	020/60 -17°	010/86 -26°	360/90 -40°	010/68 -42°	360/31 -43°
YKM	used from 50 nm out; 67 nm from the line	030/16	020/18 0°	030/30 -8°	030/23 -13°	020/40 -23°	010/73 -29°	010/54 -36°	360/29 -37°	330/16 -40°
GEG	used from 100 nm out; 71 nm from the line		050/18 -2°	060/19 -8°	L/V -11°	160/11 -24°	190/17 -31°	200/19 -35°	220/14 -37°	250/11 -41°
GPI	used from 249 nm out; 54 nm from the line		060/19 -3°	110/11 -8°	130/6 -8°	200/40 -19°	190/58 -28°	200/101 -39°	220/73 -43°	230/41 -43°
GTF	used from 399 nm out; 57 nm from the line		070/21	080/18 -6°	120/5 -5°	180/30 -14°	200/53 -24°	210/80 -38°	220/83 -44°	230/68 -46°
GGW	used from 548 nm out; 62 nm from the line		090/18 0°	140/12 -2°	150/13 -3°	200/35 -12°	230/56 -22°	240/75 -37°	240/81 -46°	240/78 -49°
MOT	used from 748 nm out; 74 nm from the line		070/8 6°	180/7 2°	220/18 -1°	240/37 -11°	250/55 -20°	250/64 -36°	250/70 -46°	250/80 -54°
GFK	used from 947 nm out; 40 nm from the line	050/18	L/V 10°	240/20 7°	240/36 1°	250/47 -11°	260/53 -21°	270/59 -36°	270/65 -47°	260/88 -56°
INL	used from 1096 nm out; 64 nm from the line	060/19	300/13 11°	240/19 7°	230/43 1°	260/54 -11°	260/50 -22°	270/66 -38°	280/70 -49°	270/79 -56°
DLH	used from 1196 nm out; 38 nm from the line	240/6	230/22 15°	250/28 11°	230/22 4°	270/33 -12°	280/47 -21°	280/59 -37°	290/65 -47°	290/88 -55°
GRB	used from 1346 nm out; 147 nm from the line	240/24	260/18 16°	270/20 11°	290/14 4°	280/24 -9°	300/34 -21°	310/51 -38°	310/54 -48°	300/71 -51°
TVC	used from 1395 nm out; 139 nm from the line	210/17	290/14 15°	310/20 9°	310/18 2°	310/24 -11°	320/35 -22°	320/53 -39°	310/45 -49°	290/58 -51°
BUF	used from 1694 nm out; 157 nm from the line	170/19	L/V 10°	040/9 6°	220/8 2°	230/15 -11°	220/33 -22°	220/47 -35°	230/55 -41°	230/56 -50°
SYR	used from 1844 nm out; 88 nm from the line	160/17	200/22 10°	250/10 6°	L/V 1°	270/11 -11°	220/25 -20°	220/66 -36°	230/89 -42°	240/74 -51°
ALB	used from 1993 nm out; 39 nm from the line	160/27	190/16 9°	200/29 7°	230/21 3°	240/24 -9°	240/43 -19°	230/65 -33°	240/91 -42°	230/99 -53°
BOS	used from 2093 nm out; 45 nm from the line	160/27	190/23 9°	260/20 7°	260/32 1°	250/48 -7°	240/56 -17°	240/59 -33°	250/75 -43°	250/94 -55°

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
SEA Seattle, WA	departure	VFR Sky: a few clouds at 5,000 feet	from the north (350°) at 11 knots	10+ mi	none	432 ft	5:53 pm PDT (00:53 UTC)
SFF Spokane, WA	199 nm out, 20 nm south of the line, tower	VFR Sky: overcast at 6,500 feet	from the northeast (050°) at 12 knots, gusting to 19	10+ mi	6,500 ft	1,956 ft	00:53 UTC
GPI Kalispell, MT	329 nm out, 4 nm north of the line, tower	VFR Sky: overcast at 3,400 feet	from the north-northeast (030°) at 13 knots	10+ mi	3,400 ft	2,976 ft	00:55 UTC
LTY Chester, MT	458 nm out, 7 nm north of the line	no report just now				3,184 ft
MOT Minot, ND	847 nm out, 4 nm south of the line, tower	marginal VFR Sky: a broken layer at 1,800 feet, overcast at 8,000 feet	from the north (010°) at 11 knots	10+ mi	1,800 ft	1,715 ft	00:54 UTC
GFK Grand Forks, ND	1007 nm out, 7 nm southeast of the line, tower	IFR Sky: overcast at 700 feet Weather: mist	from the north (360°) at 15 knots, gusting to 20	6 mi	700 ft	845 ft	00:53 UTC
EVM Eveleth, MN	1206 nm out, 7 nm southwest of the line	marginal VFR Weather: haze	from the north-northeast (030°) at 6 knots	5 mi	none	1,376 ft	01:01 UTC
SAW Marquette, MI	1425 nm out, 23 nm southwest of the line, tower	VFR	from the south (190°) at 10 knots	10+ mi	none	1,204 ft	00:48 UTC
DRM Drummond Island, MI	1575 nm out, 2 nm west of the line	VFR	from the south-southeast (160°) at 6 knots	10+ mi	none	668 ft	01:35 UTC
ART Watertown, NY	1924 nm out, 2 nm southwest of the line	VFR Sky: overcast at 3,100 feet Weather: light rain	from the south-southeast (160°) at 3 knots	10+ mi	3,100 ft	330 ft	01:04 UTC
ASH Nashua, NH	2133 nm out, 13 nm north of the line, tower	IFR Sky: a broken layer at 800 feet, a broken layer at 1,700 feet, overcast at 3,000 feet Weather: rain, mist	from the northeast (050°) at 3 knots	6 mi	800 ft	200 ft	01:31 UTC
BOS Boston, MA	destination	marginal VFR Sky: a few clouds at 700 feet, a broken layer at 2,400 feet, overcast at 3,500 feet Weather: heavy rain, mist	from the east (080°) at 8 knots	3 mi	2,400 ft	19 ft	8:54 pm EDT (00:54 UTC)

The highest airport on this list sits at 3,184 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BOS when you get there the forecast at the estimated arrival, 10:04 am EDT (14:04 UTC)

Wind from the north at 7 knots, visibility 3 miles, mist, a broken layer at 800 feet IFR

The whole forecast for BOS

From Sun 8:00 pm EDT (00:00 UTC): wind from the southeast at 4 knots, visibility 4 miles, heavy rain, mist, scattered clouds at 2,200 feet, a broken layer at 2,800 feet and more above
From Sun 10:00 pm EDT (02:00 UTC): wind from the east-southeast at 5 knots, visibility 3 miles, light rain, mist, overcast at 1,000 feet
From Sun 11:00 pm EDT (03:00 UTC): wind from the east at 6 knots, visibility 2 miles, light rain, mist, overcast at 800 feet
From Mon 2:00 am EDT (06:00 UTC): wind from the northeast at 8 knots, visibility 2 miles, light rain showers, mist, overcast at 300 feet
From Mon 9:00 am EDT (13:00 UTC): wind from the north at 7 knots, visibility 3 miles, mist, a broken layer at 800 feet
From Mon 1:00 pm EDT (17:00 UTC): wind from the north-northwest at 5 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
From Mon 11:00 pm EDT (03:00 UTC): wind from the north-northeast at 5 knots, visibility more than 6 miles, scattered clouds at 4,500 feet

The forecast for SEA, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the north at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 2,000 feet, a few clouds at 5,000 feet
From Sun 8:00 pm PDT (03:00 UTC): wind from the northeast at 6 knots, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, patches of fog, clear skies
From Mon 9:00 am PDT (16:00 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 west at 6 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind from the northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

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

6/4348 GRAND FORKS AFB, ND, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local on the route, 997 nm along the route · security · until 1 November · ZMP
6/8665 9NM E HERMAN, MI, Friday, October 9, 2026 through Tuesday, October 13, 2026 UTC 9 nm from the route, 1385 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZMP
6/8771 NW NEGAUNEE, MI, Saturday, October 10, 2026 through Thursday, October 15, 2026 UTC 6 nm from the route, 1405 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 15 October · ZMP
6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 19 nm from the route, at the destination end · drones kept away from a public gathering · starts Saturday 17 October · ZBW

Daylight

Sunset at SEA 6:27 pm PDT (01:27 UTC), at BOS 6:07 pm EDT (22:07 UTC) (civil twilight ends 6:35 pm EDT (22:35 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 Northwest · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the upper Mississippi valley · 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: Seattle-Tacoma International, General Edward Lawrence Logan International.