https://ddc-talk.com/t/full-li....st-of-united-airline
https://ddc-talk.com/t/full-li....st-of-delta-airline-
https://ddc-talk.com/t/complet....e-list-of-official-a
https://ddc-talk.com/t/dl-delt....a-airlines-customer-
https://coderanch.com/t/791113..../certification/Full-
https://ddc-talk.com/t/complet....e-list-of-delta-airl