I wish it was straightforward.....sometimes you may be asked by a particular airline ...at other times not asked ....seems particularly arbitrary and annoying
I wish there was a rule and that they'd all adhere to it ....I don't want to book onward flights if it's unnecessary ...it's frustrating and annoying . Most times I don't need to buy an onward flight but when you get to the check in counter and asked for proof it's a pain . I've always travelled with an open itinary and prefer to be flexible with my plans ....just inconvenient.