Under 42" diagonal is no problem . . . especially since last time I took one they told me under this is tax exempt too. The ones in the 30's are never a problem. TSA always . . . as in ALWAYS now inspects electronics. Do not open the box before the airport and don't put anything else inside. Nothing. They are pretty good at it and will tape it back up very well with TSA tape and a notice card inside. I always tell Delta but have never had a problem separately. If you have a microwave etc in a suitcase TSA will also inspect that . . . same deal with the tape and all. My experiences are mostly from ATL.