This article says FAA is overblowing the risk.
Researchers say FAA is really overblowing risk posed by small drones | Ars Technica
I'd like authorities to simulate how feasible it is to purposefully position a large drone in the path of an aircraft engine on climbout or finals using a drone's live on-board camera as the positioning mechanism.
The test need not turn into a DIY video for the bad guys.
A one engine shutdown is relatively benign so two drones would have to take out two engines, simultaneously, to reliably bring an airliner down.
Mickjoebill