I jumpseat on RJ's to mexico and back almost every week and Continental and Delta do not care as long as it fits in the overhead. As far as carry on bags are concerned, if you go through crew pass you can take ANY size bag. Skis, golf clubs, if you can drag it, you can take it. Last week I took one of those giant travel pro bags that you visit europe for a month as a carry on.. just pink tagged it so I didnt have to chase it down at my location....