Originally Posted by stevendorechester

The flight was about $ 280 CAD. All on AA. Summer 2013.This was bought about one week out. This is when airlines had ridiculously cheap fares from New York to Florida and also some cheap fares from MIA to YUL. I was basically sold be Expedia a ticket from New York to Miami combined with a ticket from Miami to Montreal. The flight from LGA left really early, giving me about six hours in Miami. The direct flights from LGA were a lot more for some reason.

That one worked out OK but is an example of how an airline would never sell this routing on one PNR. At least it was on one airline. Expedia was also offering the same fare with DL to MIA and AA to YUL.

I would never chance it now as airlines are not officially required to honor separate tickets when there is a misconnection. I love chatting with airline employees when they have free time. They have told me horror stories about passengers who book on OTA's and were sold two separate tickets and get stranded.

Another problem with OTA's would be a fare for a US domestic flight and some of the OTA offers a fare on Westjet or AC via a Canadian city ( or domestic Canada via the US ) sometimes on one airline, sometimes competing airlines. Obviously separate tickets put together. Good luck if something goes wrong.