I'm looking at flights from SLC to ATL and there are several flights on 757-200 aircraft and some are listed as selling FIRST class seats (A) and other flights, using the same aircraft, are listed as selling BUSINESS class (J) seats.

What's the difference here? Why does Delta do this? Is there anyway to figure out when a seat is FIRST and when it's BIZ? I use expert flyer to look for upgrade buckets and this makes it hard.

Confused?

randidliyo