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I'm looking to book flights from) Philadelphia (PHL) to Detroit (DTW). Direct flights are quite expensive. I noticed, in expanding a search to surrounding airports, that I can book from Allentown (ABE) to Detroit for far less, and the connection is through Philadelphia.

Can I book this flight but board in Philadelphia? I'll be traveling with carry-on luggage only, so on the return, it's obviously no problem. But would I be allowed through security and on to the plane in PHL with out having flown from Allentown?

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@Vince seems like the opposite - he's wanting to only take the second leg, not take the first leg. (and it makes a difference) – Mark Mayo Mar 31 '14 at 8:12
@MarkMayo Yup I was hesitating a lot about it. I am surprised we do not have a question on that. – Vince Mar 31 '14 at 8:40
Why don't you call the airline and get a definitive answer and share it with us? – user13107 Apr 1 '14 at 1:42
Mark's answer is definitive enough for me. I read the linked answer, and while not a duplicate, it is relevant. However, on an external link from there I got the idea to look at separate one-way flights, which were not crazily priced. – Thomas Taylor Apr 1 '14 at 1:46
up vote 11 down vote accepted

Don't you hate that? ;) Sadly, no, if you miss a leg of a flight at any point on a ticket, they'll cancel ALL other legs of the flight.

So unless you can get yourself to Allentown, you are unable to take that flight.

It's for various reasons, logistics, regional pricing, airport taxes, but basically, no, you can't.

Similar question here, with the same response

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This is one of the most dangerous things that people do to try to save money. If you buy a round-trip and only the first direction (making it a one-way), you will usually get away with it. (Sometimes frequent fliers get into trouble with the airline for doing this too often). But if you buy a multi-segment trip and miss the first, the remainder will definitely be cancelled quickly. The airline can sometimes work with you to use alternate routings when there are weather or mechanical problems, but you should never buy a ticket up front expecting to do something like this. – Michael Mathews Mar 31 '14 at 21:16
What is the source for your answer? The other answer you linked to doesn't mention any source either. – user13107 Apr 1 '14 at 1:43
It's on many airlines TOS, but here's a link from business insider. – Mark Mayo Apr 1 '14 at 1:54
I had a reservation cancelled because of confusion over whether or not I was on the standby list for an earlier flight for the first leg (two legs each way). I didn't think I was on the list, but I actually was and I cleared. But when I wasn't at the gate, they canceled the whole thing. I nearly lost my upgraded seats, but they did reinstate it. – Michael Mathews Apr 1 '14 at 21:29

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