Reference only — not for real-world navigation.
K6A4
Johnson County Airport · Mountain City
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
2,240 ft / 683 m
Transition Altitude
18,000 ft
Primary Channel
UNIC 122.70 MHz (CTAF/UNICOM)
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
06/24 · 4,498 ft · AsphaltUNLITFlight Planning
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Welcome to the technical flight briefing for Johnson County Airport (K6A4), located in Mountain City, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 1 active runway with a maximum elevation of 2,240 ft. Please note that this field primarily supports VFR and visual approach procedures.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
Johnson County Airport
ICAO / IATA
K6A4 / —
Municipality
Mountain City
Country
Region
US-TN — Tennessee
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
2,240 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 06 / 24
UNLIT
Runway Length: 4,498 ft / 1,371 m
Runway Width: 75 ft / 23 m
Surface Type: Asphalt
Heading: 58.2° / 238.2°
Runway Width: 75 ft / 23 m
Surface Type: Asphalt
Heading: 58.2° / 238.2°
RWY 06 (58.2°)
No ILS / Visual Only
RWY 24 (238.2°)
No ILS / Visual Only
AWOS AWOS 3
126.22 MHz
UNIC CTAF/UNICOM
122.70 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026