Controller Knowledge Test 2 (CKT2) Practice Exam

The key idea is standard enroute separation: aircraft on radar are kept five miles apart horizontally. When aircraft fly in a nonstandard formation, ATC still uses at least that five-mile buffer for the outermost member to ensure safe clearance from other traffic and to allow for any unexpected maneuvers. So at FL350, the outermost aircraft should be separated by five miles from any other aircraft. A smaller distance wouldn’t meet the standard safety buffer, while larger distances aren’t required unless ATC specifically assigns them.