As of today - Monday - the 1 hour rule is "up to the discretion of the airline." And if people need to make a trip to the restroom they will need to be accompanied by a flight attendant. So, you just need to do what I've mentioned here numerous times before - if you are having D troubles or feel you might, let a flight attendant know that you have a gastro problem that can cause D on short notice. Also, ask him/her if they are planning to enforce the 1 hr. rule. And if they are, then be sure you go to the bathroom before the time constraint starts. Go before they make an announcement though, because there will be a rush and you'll end up in line. I travel a lot - anywhere from 4-10 trips/year, both domestically and internationally, and I've never had a flight attendant not take my potential problem seriously. Be nice to them and they'll be nice to you. They don't want you to have trouble anymore than you do. If you have IBD, or even if you don't, you can join the Crohn's and Colitis Foundation of America for about $25/year. You will receive a wallet-sized card from them that says, I Can't Wait! The bearer of this card has a gastrointestinal disease that makes it difficult for them to wait for the bathroom - or something similar to that. I've used this card a couple times, and even when I don't have to use it it's just nice to know it's in my back pocket. These new rules just mean you will have to take more control over your potential situation that maybe you did before.