Expedia and Travelocity shows only those co-terminal cities. {This info is helpful when you want to purchase a cheapie ticket to BWI but the fare rule allows you to standby to DCA or IAD.} The fare rules do disclose how many online connections are permitted {sometimes unlimited but most often 4 in each direction} which helps in the construction of a routing.
Originally posted by chalf:
Doesn't this information sometimes come up in the rule display on Travelocity? Or I am getting this confused with the co-terminal origin cities (ie same fare basis from LGA/EWR)?