A one-way flight is a type of air travel where the passenger only travels to their destination and does not return. The term 'one-way flight' can also be used to describe other forms of transportation, such as a train or bus. The crossword solution for the term 'one-way flight' is 'escalator, ' which is a type of moving staircase that is used to transport people from one level to another. Escalators are commonly found in shopping malls, airports, and other public places.