The main area is to be known by local flight crews as being sharp and an excellent Paramedic. Usually most require the minimum of five years as a Paramedic level. As well, what type of EMS are you working with? Are they progressive and also perform specialty or critical care transports?
Personally, when I was hiring flight nurses and Paramedics, we liked them from an urban type system so they were used to having long patient contact time, as well have good critical thinking skills. Hospital experience, neonate, etc. is all a plus too.
Hopefully, you have already attended an CCEMT/P type course before attempting to challenge the FP-C examination. It is NOT similar to a general Paramedic examination. I highly suggest you fully understand ventilator care, as well as gas exchanges and ratios, detailed cardiology and aviation medicine.
Yes, have the usual alphabet courses... it is a standard.
R/r 911