I have booked American airlines flight from Dallas at 7.10 on 17th to Atlanta.can I wait in the airport from 16th night at 10pm. Vijayakrishnan C

Yes, you can. I had happened same situation. My flight was at 7:05a.m and I stayed at the airport from 1:00 a.m. to the departure time. Some uncomfortable on the chair. But I had a little bit slept on that night. But IF you wish close to the Terminal A you can go to the Marriot hotel (around $100.00)

Almost all airports at 24/7. Especially an International Airport like this

I think the airport is open 24 hours