Originally Posted by VPescado
Open Jaw - Fly A-B and C-A with passenger responsible for getting from B to C.
Double Open Jaw - Fly A-B, C-D, E-A
End on End - book A-B-A, and B-C-B in order to fly A-B-C-B-A.
Circle trip - A-B-C-A
Stopover - Connection that takes more than 4 hrs domstically, or 24 hours int'l, with the exception of last flight in, first flight out situation (in which case it is a normal connection).
Half round trip basis: The cost of an A-B-C-A circle trip is one half the price of the sum of the following round trip fares: A-B-A, B-C-B, C-A-B.
Acutally - combinations is really about how the fares combine - not how you fly... You can fly A-B-C-A and A-B and C-A are an open jaw and B-C one way fare (placed "end-on") .... So in that light, for end-on, booking A-b-a and b-c-b is not the issue it is that you are booked A-B-C-B-A and the way the fares are put together it might be that you have two round or circle trips end on with each other at point "B".
Another point, US, Canada one way fares work different than international fares - so if you are flying on one way fares NYC-LAX and LAX-NYC the process is "end-on", but if you are flying NYC-LON and LON-NYC on one way fares it is a 2 componant circle trip.