1
Runway
0
Frequencies
0
Procedures
0
NOTAMs
Quick Facts
ICAO
4LL9
FAA
4LL9
Elevation
642 ft MSL
Runways
1
Frequencies
0
Tower
No
Fuel
N/A
Coordinates
39.344, -89.424
Airport Information
Facility Type
AIRPORT
Elevation
642 ft MSL
Control Tower
No
Fuel Types
None listed
Coordinates
39.3437, -89.4237
Current Weather
METAR KTAZ 061221Z AUTO 27007KT 10SM SCT004 OVC085 08/08 A2995 RMK AO2
Flight Category
VFR
Wind
270° at 7 kt
Visibility
10+ SM
Temperature
8°C
Dewpoint
8°C
Altimeter
1014.30 inHg
Cloud Cover
OVC
Nearest weather from KTAZ (13 NM away)
Observed 2026-05-06 12:21Z
Runways
| ID | Length | Width | Surface | Lights |
|---|---|---|---|---|
| E/W | 1,980 ft | 75 ft | TURF | - |
Active NOTAMs
No active NOTAMs for 4LL9.
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PONTIAC
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PONTIAC
Illinois airports
4LL9 Operational Overview
Location & Facility
Alan B. Janssen Airport (4LL9) is a airport located in Morrisonville, Illinois, United States. The field sits at an elevation of 642 feet above mean sea level (MSL) at coordinates 39.3437°N, 89.4237°W.
Runways
Alan B. Janssen Airport has 1 runway. The longest runway (E/W) measures 1,980 feet by 75 feet with a turf surface.
Communications & Operations
Alan B. Janssen Airport is a non-towered (pilot-controlled) field.
Current Conditions
The current flight category at Alan B. Janssen Airport is VFR (Visual Flight Rules — good flying conditions). Weather conditions are updated in real-time from official NOAA Aviation Weather Center observations.
Frequently Asked Questions
What is 4LL9?
4LL9 is the ICAO identifier for Alan B. Janssen Airport, a public-use airport located in Morrisonville, Illinois, United States.
How many runways does Alan B. Janssen Airport have?
Alan B. Janssen Airport (4LL9) has 1 runway. See the runway table above for dimensions and surface types.
What is the elevation of 4LL9?
The field elevation of Alan B. Janssen Airport is 642 feet above mean sea level (MSL).
Is fuel available at 4LL9?
No fuel types are currently listed for Alan B. Janssen Airport. Contact the FBO directly for availability.
What are the current weather conditions at 4LL9?
The current flight category at Alan B. Janssen Airport is VFR. See the METAR section above for full decoded weather data including wind, visibility, temperature, and altimeter.
Are there active NOTAMs at 4LL9?
There are currently no active NOTAMs for Alan B. Janssen Airport.
How do I access complete data for 4LL9?
Sign up for a free AeroCopilot account to access all frequencies, full NOTAM text with AI interpretation, decoded forecasts, and IFR procedure charts for Alan B. Janssen Airport.
Where is Alan B. Janssen Airport located?
Alan B. Janssen Airport (4LL9) is located in Morrisonville, Illinois, United States, at an elevation of 642 ft MSL.