дозвіл на перетин кордону
flight clearance
envelope clearance flight
flight envelope clearance
border (security) forces /troops
border
border break (cart.)
border command
border control
border crossing arrangement
border crossing point (BCP) / station
border disputes
border management
border monitoring
border security
state border
trans-border cooperation
trans-border threat
US Border Patrol
violation of the state border
border and offshore submersible sentry
cetane number in border line
clandestine border crossing
cross-border incursion
cross-border raid
border patrol drone
border fence
flight restriction zone / flight restricted zone (FRZ)
air traffic clearance
clearance decontamination
clearance time
debris clearance
diplomatic clearance