Reddit mentions of Critical Care Transport

ACE-SAT: https://www.amazon.com/Aeromedical-Certification-Examinations-Self-Assessment-Test/dp/061519124X/ref=sr_1_1?ie=UTF8&qid=1468868935&sr=8-1&keywords=ace-sat

ASTNA Patient Transport: PRinciples and Practice https://www.amazon.com/ASTNA-Patient-Transport-Principles-Practice/dp/0323057497/ref=sr_1_1?ie=UTF8&qid=1468868951&sr=8-1&keywords=astna

Critical Care Transport: https://www.amazon.com/Critical-Transport-American-Orthopaedic-Surgeons/dp/1449642586

Those three books were the majority of my study material going in to (successfully) taking the FP-C exam.

The two pieces of flight medicine you'll need are the flight physiology and the critical care medicine. The flight physiology is pretty straightforward. Gas laws, pressures, altitudes, FAA regulations, and so forth. The critical care medicine is a lot more—you'll need the knowledge of an ICU nurse: lots of drips, lab values, central line pressures, and more.

All stuff well worth knowing.

Critical Care Transport

Critical Care Nursing: Diagnosis and Management

Air & Surface Patient Transport: Principles & Practice

Also the BCCTPC's handbook has a decent outline for FP-C and CCP-C if you're interested in getting those certs.

Critical Care Transport has a good section on this.
https://www.amazon.com/Critical-Transport-American-Orthopaedic-Surgeons/dp/1449642586