All the negative comments are wild. Trip.com was great for a 3rd party booking. You have to pay to sit together but that is every airline now. It's not automatic even if booked at same time. Anyone with a brain would know this. It says it 20 times as you are booking. If you want to be seated together you have to pay and choose seats. We had a great experience round trip. Only thing is if it's an overbooked flight you will be the first one bumped off and not refunded. So I wouldn't use them for very touristy or popular destinations or in peak season. It also notifys you of this risk about 10 times before you agree to buy the tickets. if there are changes to the flight like a delay or a gate change you won't get a notification so make sure you are keeping track. Other than that it was great.