[The Louiswu]

3 Words, Air Traffic Comtrol.

[dljordan]

“3 Words, Air Traffic Comtrol.”

Not below 18,000 feet.

[DownInFlames]

3 letters - FAA.

[JD_UTDallas]

Three more words, Class G airspace.

In the USA class G is from sfc to 700AGL or 1200 AGL

In other countries class G goes up to FL100