What are Lifeguard Flights

Date:         20 Mar 97 02:38:32 
From:         griz <griz@nowhere.org>
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I have heard the word *lifeguard* included in the call sign of aircraft
landing at BWI  for years and I always thought it was small aircraft
functioning as air-ambulances bringing seriously ill or injured patients
for one of the Baltimore hospitals.  This past week I have heard two US
Airways 737s using the call sign US AIR Lifeguard.  Can anyone tell me
why?  Do they have seriously ill people onboard and get special