Only once have I been on a Lifeguard flight and it sure does get priority handling. A number of years ago when flying on a US Airways Express flight IND-BOS, my dad who loved radio stuff was listening from the top parking level of Terminal B at Logan to his Grundig radio with aircraft frequencies among the selections to listen for my plane. He heard clearly as we got into Logan's range "Chautauqua 4898 Lifeguard" but the way I realized we were such a flight was that it was the fastest IND-BOS flight I ever had; we moved basically to the front of the landing pattern in front of other planes, and we never stopped once after landing, with everything else stopped that would intersect taxiing as we went to the terminal. The ERJ-145 pulled up much closer to the terminal than any other time and immediately after the engines started to wind down, they were popping a cargo hatch open and handing a cooler to a couple medical people that I could see out the window plainly marked "human eyes". Probably on their way to Mass Eye and Ear for transplant, what a gift for someone. Every minute being important, it made sense why we were given priority routing and clearance. Usually coming in to Logan, we would queue up with a bunch of others either coming down Revere Beach or something, but not this time--it was straight in and onto the runway. My dad told me when I met him in the terminal that he heard the Lifeguard on our plane's call sign but he wasn't able to see all the airside activity.