Alan B. Janssen Airport

4LL9 · Morrisonville, IL · 642 ft elevation

Overview Weather Runways Comms & NavAids Charts Services & info

Airport information

FAA LID: 4LL9
Coordinates: 39.3437, -89.4237
Elevation: 642 ft MSL

Detailed FAA facility data isn't available for this airport.

Weather

METAR observed

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TAF forecast

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Sun & FAA night 2026-06-21

Event	Local (CDT)	UTC
Morning civil twilight Loggable night ends	04:59 AM	09:59Z
Sunrise	05:31 AM	10:31Z
Sunset	08:28 PM	01:28Z
Evening civil twilight Loggable night begins	09:00 PM	02:00Z

Loggable night (§1.1)

09:00 PM → 04:59 AM

Night currency (§61.57)

09:28 PM → 04:31 AM

Plan a flight from 4LL9

Destination (ICAO)

TAS (kt)Burn (gph)Reserve (hr)Wind from (°)Wind (kt)

Traffic pattern

Landing runway

LEFT traffic

Landing: Rwy E
Pattern: left (turns left)
TPA: 1,600 ft MSL (≈1,000 AGL)

Enter the left downwind for Rwy E at 1,600 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).

Runway E/W

1,980 ft × 75 ft · TURF

Heading: n/a

Heading: n/a

Headings shown are true (magnetic variation unavailable).

Will it fit? Your aircraft's required runway length (from the POH) — checked against every runway here

ft · ≥1.5× comfortable, under 1.25× tight · saved across airports

Runway	Length	Your margin
E/W	1,980 ft

Nearby navigation aids

NavAid	Type	Freq	Radial / Dist magnetic
VLA · Vandalia	VORTAC	114.30	r317° / 19.3 NM
SPI · Spinner	VORTAC	112.70	r159° / 32 NM
AXC · Decatur	VORTAC	117.20	r225° / 35.3 NM

VFR sectional

Open 4LL9 on the VFR sectional (SkyVector) ↗

No published instrument procedures or Chart Supplement for 4LL9. VFR sectional link above.

No published services or facility detail for 4LL9.

Nearby airports

1IL1 · Horsefeathers Ranch Airport (6 NM)70IL · Murphy Farms Airport (8 NM)1LL5 · Justison AirportPrivate (8 NM)28IS · O K Flying Club Inc Airport (10 NM)KTAZ · Taylorville Municipal Airport (12 NM)3LF · Litchfield Municipal Airport (16 NM)

Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 4LL9 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.

About 4LL9

Alan B. Janssen Airport (4LL9) is an airport in Morrisonville, IL, at 642 ft MSL. It has 1 runway, the longest 1,980 ft. This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 4LL9, refreshed from the Aviation Weather Center and FAA NASR.

What is the longest runway at 4LL9?

Alan B. Janssen Airport has 1 runway; the longest is 1,980 ft. See the Runways tab for headings, surface, and lighting.

Where is 4LL9?

Alan B. Janssen Airport is in Morrisonville, IL, at an elevation of 642 ft MSL. Coordinates: 39.3437, -89.4237.

Fly out of 4LL9 often?

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