ALSO, you have to be careful comparing fares; although all Airlines are now required to report gross fares, including all taxes and fees, the extra baggage fees differ from airline to airline. I just checked Airtrans, to see what a RT from San Antonio to Cancun would cost me in June (it varies by date, but dates I checked, June 13 - June 20, low RT total was about $525), and I noticed that AirTrans charges for all checked luggage - $20 for first bag, $25 for second bag. Sun Country, out of DFW, USED to give you first bag free on international routes, but NOW charges for both First ($20 online, $25 at airport) and second ($30 online, $35 at airport) bags. American Airlines, for same dates in June, costs $578 for RT to Cozumel vs. $515 on Sun Country, but AA gives you first checked bag free (on flights to/from Mexico), $40 for second bag. SO, a traveler with just one checked bag each way pays $578 on AA vs. $555 on Sun Country. With 2 checked bags, that traveler pays $658 on AA vs. $615 on Sun Country.