My county has pretty aggressive protocols all around (i.e. RSI and basics giving combivent treatments), but as far as air transport is concerned there is criteria for requesting helo support such as- falls greater than 20 ft, MVA rollover w/ ejection, fatality @ scene or in same vehicle, and so on. However most medics and emts use this as a guide and if you think the pt needs a trauma center due to injuries or mech of injury than you do have the freedom to call for a helicopter. You might have to explain why the next morning but if you use good judgment then you wont have a problem.