United Airlines is the worst airline ever. They are more horrible then Spirit Airline. They changed my flights like 4 times and each time they deleted my seat selection. Then in the month of our flight, they deleted seats on a flight to Houston and changed our seats arrangements on another flight. I had to call them three times to try to get everything fix. They fixed the seats to Houston but they say their system is not updating the seats on the other flight. They told me to call 24 hours before flight to confirm, I told them that 24 hours before flight will be too late to fix it if anything is wrong. If this is what you have to deal with before even getting on to their planes, WTF will you have to deal with when your on the plane or terminal. This is not professional and it put people in inconvenience. Will never book through them again. It's a headache.