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- regular passenger flights 1
- regularity of flights 1
- regulatory framework 1
- relations of guard and protection of rights and interests 1
- relationship scale 2
- relaxation 2
- reliability 5
- reliable values 1
- religious group 1
- remote learning 1
- remote personnel management 1
- remote sensing 1
- remote work 1
- renewable energy sources 1
- reporting explicitly false information and creation thus the threat of aircraft safety in Flight 2
- reputation 1
- requirements for aviation specialists 1
- requirements for correction tools 2
- rescue 1
- research 1