This has come up many times during my years on this Forum. In my opinion, DL has the best 1st Class Bathroom police. On AA, when you pay for domestic 1st class you should only expect a bigger seat. Anything else is gravy. It's really a mixed bag. I've seen strict enforcement on some AA trans-Continental flights and little or none on others. When it is enforced, the lead attendant seems to be the Police Chief. Based on history, I expect 500 replies to this topic