Safety may pertain-to flights.Logical formLearned from54 sentences. A flight may be postponed.Logical formLearned from53 sentences. Some flights may leave.Logical formLearned from53 sentences. Flights may operate.Logical formLearned from53 sentences. (Reconnaissance flights) can be over a country.Logical formLearned from53 sentences. Some (hour flight) can be to a US-city.Logical formLearned from53 sentences. A person may cancel a flight.Logical formLearned from53 sentences. Some flight can be from a US-city.Logical formLearned from53 sentences. A status may pertain-to flights.Logical formLearned from53 sentences. A (human space flight) may pertain-to a country.Logical formLearned from53 sentences. Flights may be diverted.Logical formLearned from53 sentences. A (flight time) can be hours.Logical formLearned from53 sentences. A commercial flight can be to a world-city.Logical formLearned from53 sentences. Direct flights may undergo a resumption.Logical formLearned from53 sentences. Flights may undergo a launch.Logical formLearned from53 sentences.