My apology if this is little OT.

I will be coming in from IST on TK flight around 11 pm, and leaving MAD the next morning on AA back to the states. Does anybody know if AA checkin counter would be open that late? With a BP in hand, I probably could spend the night at the 24 hour IB lounge in 4S. I often couldn't do online checkin back for US bound flights.

Thanks for any info.