Of course the reverse happened for years. Pilots received a slot in another port where the training was to be conducted, therefore no allowances payable. In some cases, before training was even completed, or in most cases very soon after, hey presto a slot back in their original base. All costs of associated with being in another city for the duration of the training being borne by the pilot. Quite a scam, saved the company a fortune for more than a decade. Bet that one won't be leaked to the newspapers.