I booked my October Nashville to Orlando non-stop flights yesterday morning. I was on SW website at 6:00 a.m. and dates had not been posted. I kept refreshing and still at 6:15, no dates. I checked back at 6:30 and there they were. The flights I selected were $156 out of Nashville and $135 return, which I thought was decent. However, I was buying 4 tickets and by the time I typed in all the info and double checked it, when I clicked to complete the transaction, a message popped up that said the rates were no longer available! I thought once you select flights, those fares stay in your cart until the transaction is completed. So I went back and was still able to choose the same non-stop flights but the price had jumped to $195 each way! Our flights cost $400 more than the original flights I had in my cart 10 minutes after the flight times were released! I was not a happy camper, but at this point I am just happy I was able to get the non-stop flights I wanted. I checked SW throughout the day and those same flights increased to $220, then $260 each way! And this morning those flights are sold out. I searched for 1 and 2 persons instead of 4, and prices were the same. I never received the confirmation email and checked my account online and though I could see the trip listed, I couldn't access the details. Last night I called SW and spoke to an agent who said their system is being changed in May and some people have received duplicate confirmation numbers. It took her over 40 minutes to "fix" it and issue a new confirmation number for my trip. I asked her about the price changing during check out and she said that sometimes happens even when she is booking flights. While changing my trip info to the new confirmation number, she said she had noticed the huge price increases on these flights, but she was able to keep my prices the same as what I originally booked. I asked her since it had taken so long to correct the situation, if SW could give me the original price of the flights, but she said she wasn't allowed to do that! So if you don't receive your confirmation email from SW, or if you can't access your trip online, you need to call SW.