Randomization Randomization will occur by dedicated aircraft, in blocks of ten, with a 1:1 ratio. Study packages will be prepared, numbered sequentially, and tracked by a single Research Coordinator. The coordinator will maintain a confidential log of each package's randomization allocation, aircraft assignment, current location, and use. The coordinator will also receive all completed study materials and study data received from flight and paramedics crews, and all dispatch records to ensure all eligible patients were identified and screened by the paramedic crews.