0
Runways
0
Frequencies
0
Procedures
0
NOTAMs
Quick Facts
ICAO
4IS1
FAA
4IS1
Elevation
706 ft MSL
Runways
0
Frequencies
0
Tower
No
Fuel
N/A
Coordinates
40.465, -91.230
Airport Information
Facility Type
AIRPORT
Elevation
706 ft MSL
Control Tower
No
Fuel Types
None listed
Coordinates
40.4652, -91.2298
Current Weather
METAR KEOK 272015Z AUTO VRB04KT 10SM OVC015 24/21 A2991 RMK A01
Flight Category
MVFR
Wind
VRB° at 4 kt
Visibility
10+ SM
Temperature
24°C
Dewpoint
21°C
Altimeter
1013.00 inHg
Cloud Cover
OVC
Nearest weather from KEOK (12 NM away)
Observed 2026-06-27 20:15Z
Active NOTAMs
No active NOTAMs for 4IS1.
Nearby Airports in Illinois
Nearest airports
- 35IL — 7TH HEAVEN
LA MOILLE
- 35IL — 7TH HEAVEN
LA MOILLE
- KSPI — ABRAHAM LINCOLN CAPITAL
SPRINGFIELD
- 70LL — ADAMS NUMBER 1
PONTIAC
- 70LL — ADAMS NUMBER 1
PONTIAC
Illinois airports
4IS1 Operational Overview
Location & Facility
Plain Crazy Airport (4IS1) is a airport located in Carthage, Illinois, United States. The field sits at an elevation of 706 feet above mean sea level (MSL) at coordinates 40.4652°N, 91.2298°W.
Communications & Operations
Plain Crazy Airport is a non-towered (pilot-controlled) field.
Current Conditions
The current flight category at Plain Crazy Airport is MVFR (Marginal VFR — reduced visibility or ceiling). Weather conditions are updated in real-time from official NOAA Aviation Weather Center observations.
Frequently Asked Questions
What is 4IS1?
4IS1 is the ICAO identifier for Plain Crazy Airport, a public-use airport located in Carthage, Illinois, United States.
How many runways does Plain Crazy Airport have?
Plain Crazy Airport (4IS1) has 0 runways. See the runway table above for dimensions and surface types.
What is the elevation of 4IS1?
The field elevation of Plain Crazy Airport is 706 feet above mean sea level (MSL).
Is fuel available at 4IS1?
No fuel types are currently listed for Plain Crazy Airport. Contact the FBO directly for availability.
What are the current weather conditions at 4IS1?
The current flight category at Plain Crazy Airport is MVFR. See the METAR section above for full decoded weather data including wind, visibility, temperature, and altimeter.
Are there active NOTAMs at 4IS1?
There are currently no active NOTAMs for Plain Crazy Airport.
How do I access complete data for 4IS1?
Sign up for a free AeroCopilot account to access all frequencies, full NOTAM text with AI interpretation, decoded forecasts, and IFR procedure charts for Plain Crazy Airport.
Where is Plain Crazy Airport located?
Plain Crazy Airport (4IS1) is located in Carthage, Illinois, United States, at an elevation of 706 ft MSL.