[gjm11]

I don't know whether exactly that is possible, but I have had the following happen: my bag got gate-checked on an intra-US connecting flight, and my carrier then wouldn't return it until I reached my final destination in London.

Which meant that I didn't have it with me when my flight to London was cancelled and I had to stay overnight in Chicago (too bad since it had my washkit and a change of clothes in it) and that when the replacement flight was also cancelled and I ended up going to London with a different carrier, my bag didn't get home until a couple of days after I did.

I will not be flying with United Airlines again in a hurry.

[ejdyksen]

Next time just tell them you have medicine in that bag that you need in the next 8 hours (which is why you tried to carry it on).