Highest Flying Aircraft     Highest flying manned aircraft:  X-15 Highest flying drone aircraft:  X-43A Highest flying jet aircraft under power:  A-3J Highest flying U.S. jet aircraft zoom:  F-104 Highest flying absolute jet aircraft zoom:  MiG-25 Highest flying propeller aircraft:  Helios Highest flying piston multi engine aircraft:  B-29 Highest flying piston single engine aircraft:  RV-4 Highest flying piston single-engine drone:  Perseus B Highest flying piston multi-engine drone:  Condor Highest flying cargo aircraft:  C-17 Absolute highest flying helicopter:  SA-315 Highest flying turbine helicopter:  CH-54 Highest flying sea plane:  F2Y Highest flying single engine turboprop:  Egrett   Highest flying single engine piloted aircraft:  U-2 Highest flying sustained horizontal flight:  SR-71