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- operational control of flight 2
- operational efficiency 2
- operator 1
- operator of the automated air traffic control system 2
- operators 1
- optical 1
- optimal load 1
- optimal route 1
- optimal systems 1
- optimization 2
- oral communication 1
- oratorical art 2
- order of access to information 1
- organization of business events 1
- organization of combined tours 1
- organization of ground support of flight 1
- organization of independent work 1
- organization of sample research 2
- organizational and pedagogical condition 1
- organizational and pedagogical conditions 4