I'm bringing my portable steamer with me! Just in case it needs a little something! With my luck lately it would be traveling around Mexico and wouldn't make the wedding! LOL
Here's the link to purchase my steamer! It's the best thing since sliced cheese. I don't travel without it ever!
I flew US Air, and I (meaning my loving husband) carried my dress in a double garment bag through the whole airport as a 'carry on' item. I was told that they could make no guarantee and that I had to ask the woman at the terminal, who also told me they could not promise me anything. When I went in, the flight attendants even told me that I had to put it in the overhead bin, but I had a friend in first class and he just hung it there for me, no questions asked. I would bet that if you asked someone in first class if they would mind, I'm sure they wouldn't! I think it really depends on the people working the plane. MOST people would be very understanding and willing to help you, knowing it is your bridal gown!!
My gown shop pressed my dress before we left and I didn't need to do anything to it on my wedding day. It was still as perfect as day 1. If they press it nicely, it should stay. At least know this...unless something has changed...they send your items OFF SITE to have them steamed/pressed, and it will take a few days. If it were me, I wouldn't send me dress away!
Hope this helps!