If anyone heard about
the first class seats - I could use the info as well
But to be honest, I think it depends on how the plane is booked and how willing to help is the crew on board and before boarding. I travel to Europe every summer, with two kids "in tow" but so far, I was able to do it while in remission or while on predn (last year). So to be honest, I didn't have too much of bothering symptoms during the flight and hope, until March, you are better.
If you won't be able to pre book your favorite spot, just ask the crew at the gate that you should seat close to restroom. They usually are able to shuffle some other around and will make it work for you.
Good to have your meds on carry-on with the RX label on them, just in case anybody asks. And remember, take all meds you could possibly be using during your stay in Europe. When I visit my family, I usually look like pharmacy-on-the-go, but since I was diagnosed in US and staying on meds here, I rather have my full supply on me.
Avoid airplane food or pre order some vegetarian, kosher or kids meal, if unable to do it online, try call the airline. Or bring your own snacks, food. Even if they asks about
them during the security scan you can always explain what's going on. You can even ask your GI in advance to write some kind of letter about
it, that you have to stick to your diet etc. It depends on how well you tolerate different foods.
Bring wet tissues on borad with you. And since you struggle with controlling your urgency, the card would be good item to have as well as some famine pads, for easier cleaning.
If you have any food-related issues, gas etc, do as other suggested - ask your GI about
any possible meds that you could use while traveling, for other symptoms.
Anyway, I hope you'll get your UC under control for the travel. And, as I'm from Europe myself, can I ask where you're planning to go?
Keeping my fingers crossed!