That was called "Interchanging" and happened quite a bit in the 50's and early 60's. Examples included Braniff and Pan Am from the northeast to the west coast of South America, flights between the southeast and the northwest (Eastern and United or Continental?), and Pan Am and Delta between the south and London. David R http://home.comcast.net/~damiross/books.html www.sequoians.com www.chanticleers.org -----Original Message----- From: The Airline List [mailto:AIRLINE@xxxxxxxxxxxxxxxxx]On Behalf Of Mark Panitz Sent: Monday, September 12, 2005 21:30 To: AIRLINE@xxxxxxxxxxxxxxxxx Subject: Re: anyone remember interling? I remember somethig when one carrier would operate to a certain city and the another carrier would fly to their city I know American and Continental had some type of agreemnt Like say AA would fly their aircraft say to Denver then Continental would fly that same aircraft to say Seattle.. what is that called then?