[PHXFlyer]

Originally Posted by tiredofpoorservice

The flights were the exact same - time, airports, class, etc; also, there were only 3 seats available at the time I booked the ticket and they were all in the same back row.

Just for clarification "class" as it pertains to your situation doesn't mean simply the distinction between first, business or economy. Within each cabin the fares at which tickets are sold are broken down into several classes and each has a corresponding letter assigned to it. Delta's economy fare classes are Y, B, M, H, Q, K, L, U, T. For the ticket you purchased on Delta.com you can find out what class of service your ticket is booked into from the e-mail confirmation sent to you. I don't know what screen shots you took of the 3rd party websites and some will display the fare class or fare basis and some will not.