The David to Panama air corridors are in transition.
On “May 30,2011, Air Panama’s Fokker Jet carried passengers for the first time. Today they are using the jet for the 8 am and 5:15 pm flights along the David – Panama City Albrook route.”
Now Taca has been the first to announce you can book direct flights on Taca to David. Starting July 1 you can fly Aeroperlas from either Albrook or if you are on an international flight you can book Tocumen to David. source
It had been reported earlier that Air Panama under the Copa banner will also be flying the same Tocumen to David route begin July 1. I have not seen any external confirmation of that recently.