When players build up industries, like Acriculture, Chemical, Food Processing, … there could be accidents at the sites occasionly, that blocks the production until the accident is “resolved” by an Air Ambulance flight to that location.
Groups that are building industry will need to at least have capable plane that can be change to an Air Ambulance or ask other players for helping out.
There could be other random events, like “bring a doctor” or “bring maschine parts” from nearest Aqua airport to indutries as well … as there are at least 3 players involved they should find a solution 
Thanks for consideration.