We've flown half a dozen times in the last few months with wine, liquor and champagne - without mishap. We do put the bottles in plastic bags, wrap them in clothes and try to position the bottles aligned with the central spine (which sticks up a bit in our Victorinox suitcases). But Mr. Canuck's sister had a maple syrup mishap en route; half the contents of the one litre bottle were sucked up by her clothes. (Which made for a fun first night housesitting our flat while were away as she strugged to decipher the French instructions for our washing machine and dryer.)