1.   An alarm sounds in the cockpit if the wings lose lift, or stall.

2.   At night and in cold conditions, helium contracts and loses lift, and a balloon depending on helium alone must drop ballast to keep from descending.

3.   At night, when cool air chills the helium, the gas contracts and loses lift.

4.   After ascending safely from Marrakesh, Morocco, last Tuesday, the balloon abruptly lost lift and had to land in the Algerian Sahara.

5.   After flying through the core of the downburst, the aircraft encounters a tail wind, loses lift and can fall from the sky.

6.   After flying through the core of the downburst, the aircraft is buffeted by a tail wind, loses lift and can fall from the sky.

7.   Ice on a wing can cause a plane to lose lift and lead to a crash, investigators said.

8.   In the swirling turbulence as it neared the ground, one of its two rotors suddenly hit an air pocket and lost its lift.

9.   Investigators determined that the crash had been caused by vortex ring state, an aerodynamic occurrence in which a rotorcraft rapidly descending into its own turbulent wake loses lift.

10.   Since the air flowing past the wings is what lifts a plane, an airplane moving through wind shear can suddenly lose lift and be forced down.