The Disney Store at the airport is NOT a Disney Store per se, but a store Operated by HKDL Resort. That airport location only sells souvenirs/tickets/merchandise for Hong Kong Disneyland resort.
However, the only Disney Store located in Hong Kong (that I am awared of) is located in the Kowloon area, inside the lower level of Ocean Terminal Mall, which is the mall located next to the Star Ferry terminal on the Kowloon side of Vistoria Harbour. There are other Disney Stores as well... and Here is the information you need:
City Plaza 2 (852) 2967-9986
New Town Plaza, Shatin, New Territories (852) 2691-6386
Ocean Terminal (852) 2302-4772
Plaza Hollywood, Diamond Hill (852) 2955-5138
Times Square, Causeway Bay (852) 2506-1073
Whampoa Gardens, Hung Hom (852) 2994-8632