Thank you Kit Sandbumps KG
The difference between droplet and aerosol is basically size. An aerosol is iso or hypobaric and floats. An analogy is air freshener which stays in the air, but with expired breath we are talking even smaller particles. CDS in the US suggest an aerosol can remain in still air for 3 hours, but obviously not in an aircraft cabin. A droplet is a much larger particle - for example a visible lump of sputum so more relevant if a person coughs at you and the droplet falls on your face. Otherwise it falls on the floor.
The best place to go is CDC who estimate 80% of spread is aerosol, and 20% from touching surfaces - the virus will live 72 hours on stainless steel, a little less on plastics, and 24 hours on cardboard. If you touch the virus it is quite safe until you touch your face. It is only spread from airway to airway. Hence dont touch your face and wash your hands as often as possible.
Obviously you can be infected via a droplet but you have to be face to face and the other person has to produce a droplet eg cough. an aerosol has a longer range, Stays in the air and merely needs the other person to exhale.
Sadly airports ARE high risk. Most airlines were removing seatback magazines and cleaning with disinfectant. The virus has a lipid coat which is destroyed very easily so it is possible to clean cabins but the risk then depends upon both the load factor and the behavior of the passengers plus the ability of cc to stick to the protocol.