Most pilots have heard at some point that ATC separates aircraft on a first come, first served (FCFS) basis, but have experienced the opposite. Many of us pay for our aircraft by the hour, so it's understandable to get impatient when you're first up and Tower tells you there will be others ahead of you. Nearly every day when I'm working Tower I'll hear, "Uhhh, Tower, N12345 is still ready for departure," (when passed up) or even a quick, "Tower, N12345 was first..." It's not the pilot's fault. Determining who gets to do what and when, while largely driven by FCFS also must be decided with the big picture in mind. The main reasons are actually lined out in the 7110.65, section 2-1-4 "Operational Priority." As controllers, this is the very foundation on how we start to prioritize the mentality of FCFS. Some of the many factors that might "adjust" a pure FCFS schedule include: aircraft type or status (Mede-vac?), IFR or VFR, route, weather, flow, workload, etc.
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