We fly Jetblue out of BWI all the time now. We are not fans of SW. But when we do fly SW, we always buy early birds. While you choose your seat assignment on Jetblue, you do have to pay for luggage. If you "prebuy" your luggage its generally the same cost as the SW earlybirds. Also, all in your party has to do the prebuy if one does. So if there are 3 of you and you only need to check 2 bags, then buy tickets for 2 with luggage and go back and buy a ticket for one with no luggage....keeping in mind that the one needs to be an adult because there is an issue with the computer seeing an unaccompanied minor if the 3rd one is not an adult. Hope that makes sense. We are Jetblue CC holders so we don't pay for luggage. That one nonstop a day is always a little scary. Knowing that something could go wrong, we always have a backup plan which involves flying into Reagan and renting a car to BWI. Not the best scenario, but something that works. We are also trueblue members and you should join that if you think you might fly them in the future. They have a thing called family pooling where all the family members' points can go into a lead family members account. So if there are 3 in the family and all get 500 trueblue points for a flight, then the lead gets 1500 points from that flight. Some flights to MCO are as low as 3,400 points, so you get a free flight quickly. My daughter averages 2 free flights a year (one way) because of family pooling. We get alot of free flights a year, between trueblue points and using their JB creditcard.