Alderslade is currently senior public affairs and PR manager at the Airport Operators Association. Before the AOA, he worked for ICG and as a researcher and campaign manager for the Conservative Party.
He will join BATA next month, succeeding Nathan Stower who will take up a senior role with the airline Virgin Atlantic.
Alderslade said: "It is a huge privilege and challenge to be joining BATA at such an important time for the UK airline industry. Passengers, businesses and the wider economy rely on BATA members and the organisation must continue to play a key role in representing and promoting the importance of the sector."
BATA has 11 member airlines including British Airways, Monarch and easyJet, and 20 associate members, all non-airline organisations connected with the industry, such as manufacturers, suppliers and aviation law firms.