11.   The balloon had drifted too far south over India and was out of range of the high altitude jet stream winds, said Noble.

12.   The last flight also was plagued by worries that Fossett, who will be propelled eastward around the globe by high altitude winds, did not have enough oxygen.

13.   The Orbiter can control its own altitude but will rely on high altitude jet stream winds and other air currents for propulsion.