I recently booked a business trip. While pricing tickets trying to get the best deal, I was frustrated with Southwest because the website wouldn't let me select my departure airport and then choose the destination airport.

Now I know why. I was leaving from a Southwest airfield and trying to fly to an AirTran airfield. I thought perhaps either my computer browser was screwed up, or Southwest's website was having issues. My blood pressure would have been much lower that day had Southwest's website told me this upfront.