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The Pilots Desk
Small airport

Alan B. Janssen Airport

ICAO 4LL9🇺🇸 Morrisonville
Coordinates
39.3437°N, 89.4237°W
Elevation
642 ft (196 m)
Type
Small airport
Region
US-IL
Time zone
Chicago(UTC-05:00)
Magnetic variation
2.6° W

Daylight today(Jul 17, 2026, local time)

Civil dawn
05:14
Sunrise
05:45
Sunset
20:23
Civil dusk
20:55

About 14h 38m of daylight. Civil twilight (dawn/dusk) approximates the FAA definition of night for logging and currency. Times are computed and approximate — verify with official sources.

About Alan B. Janssen Airport

Alan B. Janssen Airport is a small airport in Morrisonville, United States. It sits at an elevation of 642 ft (196 m) and has 1 runway, the longest 1,980 ft / 604 m. It observes America/Chicago local time. The nearest airport is Horsefeathers Ranch Airport (1IL1), about 6.1 nm to the s.

Summary generated from this airport’s structured data — reference only.

Map

Runway centrelines, navaids and overlapping airspace. Tiles © OpenStreetMap contributors. Reference only — not for navigation.

Runways (1)

RunwayLengthWidthSurfaceLightingStatus
E / W1,980 ft / 604 m75 ftTurfUnlitOpen

Tall obstacles nearby

ObstacleHeight AGLTop (MSL)Lit
SpectraSite Communications, LLC. through American Towers, LLC.312 ft650 ft
Obstacle689 ft

Tallest obstacles within ~10 nm. Data via OpenAIP. Reference only — consult official charts.

Nearby airports

Great-circle distance and true bearing from Alan B. Janssen Airport.

Live tracking (FR24) Open in Maps
🇺🇸 More airports in United States📘 Flying in the United States: a pilot's guide

Frequently asked questions

Where is Alan B. Janssen Airport located?

Alan B. Janssen Airport is small airport located in Morrisonville, United States, at an elevation of 642 ft (196 m).

How many runways does Alan B. Janssen Airport have?

Alan B. Janssen Airport has 1 runway, the longest being 1,980 ft / 604 m.

What time zone is Alan B. Janssen Airport in?

Alan B. Janssen Airport is in the America/Chicago time zone (UTC-05:00).

What is the magnetic variation at Alan B. Janssen Airport?

The magnetic variation (declination) at Alan B. Janssen Airport is approximately 2.6° W, per the World Magnetic Model. Variation changes slowly over time — always use the current value charted for navigation.

What airports are near Alan B. Janssen Airport?

The nearest airport to Alan B. Janssen Airport is Horsefeathers Ranch Airport (1IL1), about 6.1 nm to the s, followed by Kleinik RLA Airport and Murphy Farms Airport.

Is the information on this page suitable for flight planning?

No. Alan B. Janssen Airport data here is for reference and training only — not for navigation. Always consult official sources and current charts before any flight.