Originally Posted by Short Final

This is something called "throwaway ticketing".

It is very much verboten and frowned upon by the airlines.

Do it once, maybe twice... and you'll probably get away with it.

Make a regular thing of it, and you'll very likely receive attention from the Revenue Protection departement at the airline who will don some rubber gloves and conduct an audit on you. Amongst other things, expect your BAEC membership to be taken away from you.... permanently.

In this age of "big data" and all the analysis the airlines can do on their ticket sales, don't kid yourself thinking you can hide for long doing that sort of thing.