Why do people keep talking about specific airlines allowing whatever, when it is the airports that say whether or not you can take baggage through. Check in desks rarely even look at one's cabin luggage, let alone weigh it/check sizes. I doubt I've ever travelled under the onboard weight allowance [if there is one].
However the security guys when you go through passport control will certainly check to see if your luggage does fit in the size check frame, which of late are determined by the Government, not the airlines]. They are then are difficult if it's even just the straps that stop it fitting. That's in the UK BTW, flying back to the UK no-one seems that bothered. Obeying petty + irrelevent rules is a very British trait.
People who are like that are called 'Jobsworths'. As in "More than my job's worth."
jj, that's partly correct. Depending on the airline the check-in staff can be quite anal about the size of carry-on bags eenthough the regulation itself may have been issued by the Government. And some do insist that they be weighed, though this is less frequent. The business about the straps fitting inside the metal frame is a UK-specific add-on which most other countries do not require. Because it is an unusual restriction, the makers of most of the compliant backpacks assume the straps can be outside the dimension limits. In the UK these packs would be rejected, and that is why I shall not risk taking my stuff to the UK until they change this. I have nailed this problem onto BA for resolution, in another letter to the CEO, because they have the clout to talk with DfT - I have none, not even being a citizen of the UK. Photographers in the UK who need to travel with alot of equipment should be up-in-arms about this stuff and bothering their MPs about it.