Airlines pre-plan their diversions for the event of an emergency, but if they are in a position to choose, then they will.
DTV is at a minor disadvantage at the moment, we do not have limited facilities overall, we have temporary ATC closures whilst a new radar controller is trained up, something which takes time due to the intricate nature of the role, and despite June being quoted fire cover is still set to go up to CAT6. Opening hours are sufficient.