(St. Michael’s Hospital) ‘Is there a doctor on board?’Hearing this call go out at 36,000 feet can be anxiety-provoking for any physician and may trigger a dilemma of whether to respond, or wait to see if anyone else will offer their expertise.That’s why physicians at St. Michael’s Hospital have developed practical recommendations for in-flight medical emergencies for healthcare professionals, published online today in the journal CMAJ.