Didn't you see that recent story about three different companies making jet packs that are already on sale? Jet Pack international has one that flies for 33 seconds and Thunderbolt Aerosystems has one that flies for 75 seconds. They both think that within a year they will have developed models that can stay aloft for more than 15 minutes! Right now they all cost over $100,000, but with mass production I'm sure that cost will plummet. See the July issue of Popular Mechanics and the C/Net news release on January 29, 2008.