A boarding pass for arrival and departure from abc airport
A flight ticket for a flight that arrives and departs from abc airport
A return ticket from abc airport
(1) A boarding pass for arrival and departure from abc airport
(2) A flight ticket for a flight that arrives and departs from abc airport
両方とも「abc空港発着の航空券」という意訳の訳出です。
(3) A return ticker from abc airport
「abc空港発着の往復航空券」
(1)(2)(3) それぞれの文頭に 'My friend accidentally bought' を付け足し'My friend accidentally bought a return ticket from abc airport' のようにすることで「友達が間違えてabc空港発着の航空券を買ってしまった」になります。