For years, dating to even before joining *A, A3 (Aegean) had a published policy that they would always provide a separate bus for business class passengers, although I've seen a few VVIPs diverted to a private Mercedes station wagon instead. It was considered part of the perks associated with the fare, and appelied even to very short domestic leisure routes to/from/between Greek islands. If A3 can do this, it should also be possible for TG at its home airport hub.