air - anti
- ALT process
- altar
- altar platform
- altax
- altazimuth
- alterable grating
- alteration
- altering error
- alternate
- alternate (alternative )routing
- alternate (alternative )routing
- alternate aerodrome
- alternate angles
- alternate block
- alternate cleaning
- alternate console
- alternate deposition
- alternate design
- alternate destination
- alternate fields
- alternate frequency
- alternate fuel
- alternate fuel tank
- alternate horizontal and vertical stands arrangement
- alternate key stroke
- alternate load
- alternate mark
- alternate mark inversion
- alternate mode
- alternate motion
- alternate path retry
- alternate picture dots
- alternate route
- alternate segment
- alternate stress
- alternate tool selection
- alternate vessels
- alternate [alternating] current
- alternate [alternating] mark inversion signal
- alternate [alternating] series