Im only a student, but at my peds clinicals here in St. Petersburg, Florida we toured the helopad for Bayflite (All Children's Hospital and Bayfront Medical Center). It was AMAZING! They do not take emergent calls, but transport from the scene, hosp to hosp, etc. They have a pilot, Medic, Physician, and Nurse on board the chopper and a team of EMT, Nurse, and Paramedic on the vehicle. They can transport premies from 23wks gestation to 18yo. They advised us that at least 5 years ICU experience is necessary as wells as CCRN, ACLS, and PALS.
It might not seem like it, but its a very dangerous job. We had a chopper crash here in Tampa a few years ago and a team of 4 were killed. Very sad