What's the difference between 'open ended tickets’ and 'open return tickets'?

[Akiko]

Does anyone know the difference between 'open ended tickets' and 'open return tickets'? Are 'open ended tickets' also called 'open tickets'?

Many thanks in advance. :)

[Mister Micawber]

They are all the same. Though I suppose that 'open (ended)' could refer to the departure date as well, it normally refers only to the return flight.
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Native English teacher at Mister Micawber's