Definition
AIRCRAFT HAZARD AREA (AHA)
Used by ATC to segregate air traffic from a launch vehicle, reentry vehicle, amateur rocket, jettisoned stages, hardware, or falling debris generated by failures associated with any of these activities. An AHA is designated via NOTAM as either a TFR or stationary ALTRV. Unless otherwise specified, the vertical limits of an AHA are from the surface to unlimited.
- See: CONTINGENCY HAZARD AREA
- See: REFINED HAZARD AREA
- See: TRANSITIONAL HAZARD AREA
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).