I'm not sure an airline pulling out can ever be perceived as "good news".
One aeroplane on routes that are already well served, no big deal I would say.
However, does EDI not have APD just the same as GLA? And will EDI not be similarly affected by Brexit as GLA? If the answer to those questions is YES, and I believe that it is, then this is Valdermort Airlines making excuses for making cuts rather than being honest.