Plane drops are near zero

[Blue Aero]

Out of the last 27 airplanes (three flights) my planes dropped a total of three items - and two of those items were earplugs which drop 100% of the time. This is very discouraging and not worth the time or the money I've been putting into the game. I had no problem buying fuel and flight items (if I was out) when my planes were bringing back items but not when they bring back nothing whatsoever.