I agree with talking to flight attendants!! I chose to play "dumb" and brought my dress in a garment bag (even though another bride on the flight was told to pack hers!!!! She was pissed when she saw me with my dress.) I told the check-in that I wanted to bring it as carry-on and they let me. I flew Air Transat and there were no closest, BUT what we did was lie the dress across all the bags in the overhead. It actually worked out REALLY well and the dress was fine. Mind you, mine was all lace (no silk to wrinkle), but I think it worked out perfectly. My good friend is getting married in Cuba in a few months and she's going to do the same thing; show up at the check-in with her dress in-hand and tell them she's taking it onboard as carry-on. They're usually pretty accomodating for brides!! As for the groom's suit: We packed my husband's pants/shirt tie. There was an iron at the resort, but we just made sure to take everything out of the suitcase right away and hang it all up. Good luck!