frei - fuel
- freight
- freight aircraft
- freight airport
- freight carrier
- freight charge
- freight consolidator
- freight container
- freight declaration
- freight hold
- freight rate
- freight revenue
- freight tonne-kilometer(s)
- freight tonne-kilometer(s)
- freight tonne-mile
- freight traffic
- freight-all-kinds
- freight-all-kinds rate
- freighter
- freighter version
- freon system
- frequencies assignment
- frequency
- frequency analyser
- frequency band
- frequency changeover
- frequency changeover procedure
- frequency converter
- Frequency Coordinating Body
- frequency deployment
- frequency deviation
- frequency distortion correction
- frequency distribution
- frequency diversity
- frequency drift
- frequency filter
- frequency meter
- frequency of operations
- frequency range
- frequency response
- frequency spacing
