My mom and sister traveled from Detroit to San Jose, Costa Rica with a layover in Atlanta. From Detroit to Atlanta, even when I have purchased 2 seats together, they were placed in different seats. My sister doesn’t have too much experience traveling, so by the time that she told me about it, they were already seated on the plane so they couldn’t do anything about it. From Atlanta to San Jose, the lady at the front desk told her that she hasn’t purchased the seats together so my sister had to show her the email confirmation in order for them to be seated together. My mom is a senior and it was very inconvenient that the two of them weren’t seated together in the first flight. Plus, I lost the money I paid for those seats when I purchased the flight tickets.