easy peasy
You need permission of the people involved, and a model release from them.
You need permission from the owner of the aircraft.
You need to be aware of the EMI problems that might effect the radio and navigational equipment, this is not a major factor.
If mounting cameras externally, there are some problems to be considered.
Small cameras are common now so no great problems there, wide angle lens essential, as is an "audio feed".
This is what we do, in UK.
glf