oper - over
- operability test
- operate an airline
- operate at idle power
- operate from the aerodrome
- operate in compression
- operate in tension
- operate on airline
- operate on fuel
- operate with facts
- operate with figures
- operating aerodrome
- operating agency
- operating an airline
- operating area
- operating at idle power
- operating base
- operating ceiling
- operating company
- operating conditions
- operating control
- operating cruise
- operating engine
- operating envelope
- operating environment
- operating expenses
- operating forces
- operating from the aerodrome
- operating height
- operating in compression
- operating in tension
- operating instruction
- operating lease
- operating limit
- operating limitations
- operating load
- operating losses
- operating manual
- operating mechanism
- operating on airline
- operating on fuel
