Plan a flight · Mon 6:58 am EDT (10:58 UTC)

Montgomery County Airpark to Long Island Mac Arthur Airport GAI → ISP

211 nautical miles (243 statute miles) northeast on a straight line, true course 061°, about 070° magnetic at the departure end (variation 9W). At 120 knots that is 1 h 15 min at the quickest height in today's winds (34,000 ft, a 48-knot tailwind), arriving about 8:13 am EDT (12:13 UTC). Right now GAI is IFR, wind from the northwest (320°) at 5 knots; ISP is IFR, wind from the northeast (040°) 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: 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

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 whole route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the last 173 nm of 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 GAI.

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

urgent SF50 descending, 27 nm north, 6:50 am EDT (10:50 UTC): light turbulence, overcast above 1,200 ft, remarks: during the descent runway 5. 153 nm along the route, 27 nm north of the line.
as filed, and in English
```
MMU UUA /OV MMU/TM 1050/FLDURD/TP SF50/SK OVC012/TB LGT/RM DURD RWY 5
```
Report
an urgent report filed through MMU
Where
over MMU
Time
10:50 UTC
Height
during the descent
Aircraft
SF50
Sky
overcast from 1,200 ft
Turbulence
light
Remarks
during the descent runway 5
E75S at 15,000 ft, 5 nm southeast, 6:35 am EDT (10:35 UTC): moderate turbulence, remarks: dca arrival from 12,000 ft to 15,000 ft during the descent. 48 nm along the route, 5 nm southeast of the line.
as filed, and in English
```
BWI UA /OV BAL060030/TM 1035/FL150/TP E75S/TB MOD/RM DCA ARRIVAL 120-150 DURD
```
Report
a routine report filed through BWI
Where
30 nm northeast (060°) of BAL
Time
10:35 UTC
Height
at 15,000 ft
Aircraft
E75S
Turbulence
moderate
Remarks
dca arrival from 12,000 ft to 15,000 ft during the descent
E170 at 23,000 ft, 33 nm southeast, 6:28 am EDT (10:28 UTC): moderate turbulence above 23,000 ft. 67 nm along the route, 33 nm southeast of the line.
as filed, and in English
```
DOV UA /OV ENO/TM 1028/FLF230/TP E170/TB MOD 230
```
Report
a routine report filed through DOV
Where
over ENO
Time
10:28 UTC
Height
at F230
Aircraft
E170
Turbulence
moderate at 23,000 ft
B39M descending, 19 nm southwest, 6:42 am EDT (10:42 UTC): overcast above 4,000 ft. At the departure end, 19 nm southwest of the line.
as filed, and in English
```
IAD UA /OV RWY 1R/TM 1042/FLDURD/TP B39M/SK OVC 040/WX 10 SM
```
Report
a routine report filed through IAD
Where
runway 1R
Time
10:42 UTC
Height
during the descent
Aircraft
B39M
Sky
overcast from 4,000 ft
Weather
10, miles
B737 at 700 ft, 11 nm southeast, 5:33 am EDT (09:33 UTC): remarks: light rain. 19 nm along the route, 11 nm southeast of the line.
as filed, and in English
```
BWI UA /OV BWI/TM 0933/FL007/TP B737/RM LIGHT RAIN
```
Report
a routine report filed through BWI
Where
over BWI
Time
09:33 UTC
Height
at 700 ft
Aircraft
B737
Remarks
light rain
B738 climbing, 8 nm southeast, 6:33 am EDT (10:33 UTC): remarks: during the climb runway 01 ilg bases 700 ft. 77 nm along the route, 8 nm southeast of the line.
as filed, and in English
```
ILG UA /OV KILG/TM 1033/FLDURC/TP B738/RM DURC RY01 ILG BASES 007
```
Report
a routine report filed through ILG
Where
over KILG
Time
10:33 UTC
Height
during the climb
Aircraft
B738
Remarks
during the climb runway 01 ilg bases 700 ft
B739 at 20,000 ft, 8 nm southeast, 6:05 am EDT (10:05 UTC): light rime icing, -10 °C. 77 nm along the route, 8 nm southeast of the line.
as filed, and in English
```
ILG UA /OV DQO/TM 1005/FL200/TP B739/TA M10/IC LGT RIME
```
Report
a routine report filed through ILG
Where
over DQO
Time
10:05 UTC
Height
at 20,000 ft
Aircraft
B739
Temperature
−10 °C
Icing
light rime
A320 climbing, 2 nm southwest, 6:42 am EDT (10:42 UTC): a routine report with nothing remarked on. 182 nm along the route, 2 nm southwest of the line.
as filed, and in English
```
JFK UA /OV JFK150005/TM 1042/FLDURC/TP A320/SK 010-TOP024
```
Report
a routine report filed through JFK
Where
5 nm southeast (150°) of JFK
Time
10:42 UTC
Height
during the climb
Aircraft
A320
Sky
010-TOP024
B737 climbing, 0 nm southwest, 6:05 am EDT (10:05 UTC): a routine report with nothing remarked on. At the destination end, 0 nm southwest of the line.
as filed, and in English
```
ISP UA /OV ISP/TM 1005/FLDURC/TP B737/SK BASES 009
```
Report
a routine report filed through ISP
Where
over ISP
Time
10:05 UTC
Height
during the climb
Aircraft
B737
Sky
bases 900 ft

Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 2 forecast points nearest it (ACY, JFK). 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	360° at 14 kt	+7 kt		113 kt	1 h 52 min	8:50 am EDT (12:50 UTC)
5,500 ft	340° at 11 kt	+1 kt		119 kt	1 h 46 min	8:44 am EDT (12:44 UTC)
7,500 ft	330° at 11 kt	−1 kt	9 °C	121 kt	1 h 45 min	8:43 am EDT (12:43 UTC)
9,500 ft	330° at 12 kt	−1 kt	5 °C	121 kt	1 h 45 min	8:43 am EDT (12:43 UTC)
11,500 ft	330° at 13 kt	0	3 °C	120 kt	1 h 46 min	8:44 am EDT (12:44 UTC)
13,500 ft	320° at 12 kt	−2 kt	-1 °C	122 kt	1 h 44 min	8:42 am EDT (12:42 UTC)
15,500 ft	300° at 11 kt	−6 kt	-5 °C	126 kt	1 h 40 min	8:38 am EDT (12:38 UTC)
17,500 ft	280° at 12 kt	−9 kt	-9 °C	129 kt	1 h 38 min	8:36 am EDT (12:36 UTC)
18,000 ft FL180	280° at 12 kt	−10 kt	-10 °C	130 kt	1 h 37 min	8:35 am EDT (12:35 UTC)
24,000 ft FL240	240° at 20 kt	−20 kt	-22 °C	140 kt	1 h 30 min	8:28 am EDT (12:28 UTC)
30,000 ft FL300	230° at 45 kt	−45 kt	-34 °C	165 kt	1 h 17 min	8:15 am EDT (12:15 UTC)
34,000 ft FL340	230° at 48 kt	−48 kt	-40 °C	168 kt	1 h 15 min	8:13 am EDT (12:13 UTC)
39,000 ft FL390	240° at 48 kt	−48 kt	-49 °C	168 kt	1 h 15 min	8:13 am EDT (12:13 UTC)

Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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
ACY	used from 0 nm out; 99 nm from the line	350/12	340/12 11°	340/12 6°	340/13 2°	270/10 -10°	240/17 -23°	230/46 -33°	230/46 -40°	240/46 -49°
JFK	used from 144 nm out; 13 nm from the line	020/25	290/9 12°	300/12 7°	320/14 3°	290/17 -10°	240/27 -21°	240/44 -36°	240/53 -41°	240/51 -50°

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
GAI Gaithersburg, MD	departure	IFR Sky: a broken layer at 800 feet, overcast at 5,500 feet	from the northwest (320°) at 5 knots	10+ mi	800 ft	538 ft	6:08 am EDT (10:08 UTC)
MTN Baltimore, MD	38 nm out, 9 nm south of the line, tower	marginal VFR Sky: overcast at 1,100 feet	from the north-northwest (340°) at 6 knots	10+ mi	1,100 ft	22 ft	10:45 UTC
ILG Wilmington, DE	77 nm out, 8 nm southeast of the line, tower	IFR Sky: overcast at 800 feet	from the north-northwest (340°) at 10 knots	10+ mi	800 ft	79 ft	10:51 UTC
PNE Philadelphia, PA	115 nm out, 2 nm west of the line, tower	IFR Sky: overcast at 600 feet	from the north (350°) at 9 knots	10+ mi	600 ft	119 ft	10:54 UTC
EWR Newark, NJ	163 nm out, 16 nm north of the line, tower	marginal VFR Sky: overcast at 1,000 feet	from the north (360°) at 11 knots	10+ mi	1,000 ft	17 ft	10:51 UTC
FRG Farmingdale, NY	192 nm out, 5 nm northeast of the line, tower	IFR Sky: overcast at 900 feet	from the north (010°) at 10 knots	10+ mi	900 ft	81 ft	10:53 UTC
ISP New York, NY	destination	IFR Sky: overcast at 600 feet Weather: mist	from the northeast (040°) at 8 knots	6 mi	600 ft	98 ft	5:56 am EDT (09:56 UTC)

The highest airport on this list sits at 538 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At ISP when you get there the forecast at the estimated arrival, 8:13 am EDT (12:13 UTC)

Wind from the north at 12 knots, visibility more than 6 miles, a broken layer at 800 feet, overcast at 1,500 feet IFR

The whole forecast for ISP

From Mon 5:00 am EDT (09:00 UTC): wind from the north-northeast at 12 knots, visibility 6 miles, mist, showers nearby, scattered clouds at 400 feet, overcast at 800 feet
From Mon 8:00 am EDT (12:00 UTC): wind from the north at 12 knots, visibility more than 6 miles, a broken layer at 800 feet, overcast at 1,500 feet
From Mon 11:00 am EDT (15:00 UTC): wind from the north at 11 knots, visibility more than 6 miles, a broken layer at 2,500 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 8 knots, visibility more than 6 miles, a few clouds at 2,500 feet, scattered clouds at 5,000 feet
From Mon 10:00 pm EDT (02:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 5,000 feet, a few clouds at 15,000 feet

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

4/9383 WASHINGTON, DC., USA 4 nm from the route, at the departure end · security · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 5 nm from the route, at the departure end · a VIP movement · today · ZDC
6/8800 Baltimore, MD, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 6 nm from the route, 29 nm along the route · drones kept away from a public gathering · starts Saturday 17 October · ZDC
5/2811 NEW YORK, NY, Monday, October 20, 2025 through Tuesday, October 20, 2026 Local 15 nm from the route, 173 nm along the route · security · until 20 October · ZNY

Daylight

Sunset at GAI 6:34 pm EDT (22:34 UTC), at ISP 6:17 pm EDT (22:17 UTC) (civil twilight ends 6:44 pm EDT (22:44 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 Northeast · 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: Montgomery County Airpark, Long Island Mac Arthur Airport.