An aircraft carrier holds nearly 100 aircrafts which should not all be placed on deck; a number of the aircrafts will be kept inside the hangar beneath the flight deck. An aircraft carrier elevator is needed to move the aircrafts in and out of the hangar. This latest photo shows the J-15 fighter jet conducting tests to be lowered into and lifted out of the Liaoning aircraft carrier hangar, signaling another Chinese breakthrough in crucial aircraft carrier technology. [Photo/huanqiu]