I have a 12" PowerBook and love it for its size and weight, but ever since I sold my 1Ghz TiBook, I've missed its big, bright 15" LCD. I'm either in the market for a MBP or a MacBook (when released) but fear even the 13" rumored LCD will be too small for me. I'll be travelling internationally for work several times a year, and...unfortunately...i'll be in coach. I've used the 12" in coach before and I've been fine as far as space goes. I never had the opportunity to fly with my ol' TiBook though. MBP and 15" PB owners: What are your experiences with your laptops in coach flights? Will the MBP suck up considerably more space than the 12"?