Johnson County Airport (6A4), Tennessee
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
Johnson County Airport (6A4) is a public-use field in Mountain City, Tennessee, sitting at 2,241 feet elevation amid mountainous terrain that defines much of its operating environment. A single asphalt runway serves business aviation traffic that remains modest in volume, with fuel available for both piston and turbine operators during posted hours. The nearest customs service is located at Tri-Cities Airport (KTRI), roughly 28 nautical miles away, since 6A4 itself has no onsite customs processing.
Runways
Johnson County Airport has one paved runway, 07/25, 4,498 ft long and 75 ft wide, with an asphalt surface.
Source: FAA Form 5010.
Fuel and airfield services
Johnson County Airport has Jet A+ and 100LL available on the field. Fueling is available from 9am to 6pm, daily, and the airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
Johnson County Airport does not clear customs. The nearest port of entry is Tri-Cities (KTRI), 28 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
Johnson County Airport recorded 180 business aviation movements in 2025. Traffic peaks in April and October. Business aviation traffic at 6A4 shows its highest monthly counts in April and October, according to 2025 FAA TFMSC data.
Business jet movements, FAA TFMSC count. Peak month October, 26 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Johnson County Airport averages 1.4 days above 90°F in July, 24.9 freeze days in January and 1.3 snow days in February. July is the warmest month, with average highs of 82.0°F, and January the coldest, at 45.5°F.
Weather station is 3.5 NM from the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
Johnson County Airport has published operating constraints in three categories: runway notes, environmental and other notes.
Pilot-activated PAPI serves both Runway 07 and Runway 25; MIRL for Runway 07/25 is also pilot-activated via CTAF.
The Runway 07 PAPI does not provide obstruction clearance beyond 1.4 NM from the threshold. The Runway 07 PAPI is unusable beyond 5 degrees left of centerline.
The Runway 25 PAPI does not provide obstruction clearance beyond 1.4 NM from the threshold. The Runway 25 PAPI is unusable beyond 8 degrees left of centerline.
Deer and birds are present in the vicinity of the airport.
Mountainous terrain and high peaks surround the airport in all quadrants; transient night operations are not recommended.
This is a cold temperature airport. Altitude correction is required at or below -9C.
For clearance delivery, contact Atlanta ARTCC.
Source: FAA Chart Supplement.
Nearby airfields
Johnson County Airport has five airfields within 29 NM. The closest is Elk River, 15.84 NM south.
Source: Skystar calculation from official coordinates.
Skystar at 6A4
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$1,200.00 catering order at 6A4.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
It does not move with the size of the order.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
What runway does 6A4 offer for arriving business aircraft?
Johnson County Airport (6A4) has a single runway, 07/25, measuring 4,498 feet long and 75 feet wide with an asphalt surface. This is the only paved runway at the field, so all fixed-wing traffic uses this same strip regardless of wind direction. There is no parallel or crosswind runway option at this airport.
Are there approach lighting limitations pilots should know about at 6A4?
Yes, Johnson County Airport (6A4) has PAPI limitations on both runway ends. The Runway 07 PAPI does not provide obstruction clearance beyond 1.4 NM from the threshold and is unusable beyond 5 degrees left of centerline. The Runway 25 PAPI has the same 1.4 NM clearance limit and is unusable beyond 8 degrees left of centerline.
Where is the closest customs facility to KTRI region airport 6A4?
Johnson County Airport (6A4) has no onsite customs processing, so aircraft requiring customs clearance must route through Tri-Cities Airport (KTRI). KTRI lies approximately 28.33 nautical miles from 6A4 on a bearing of 277 degrees. Dispatchers planning international arrivals should coordinate clearance at KTRI rather than expecting service at 6A4 directly.
What operational hazards are noted for night operations at 6A4?
Johnson County Airport (6A4) sits amid mountainous terrain with high peaks surrounding the field on all quadrants, and transient night operations are not recommended as a result. Deer and birds are also reported in the vicinity of the airport, adding to the situational awareness pilots should maintain. These factors combine with the PAPI obstruction clearance limits already noted for both runway ends.