Hi:
I am currently a business analyst. I also have significant experience as an air traffic controller (tower and radar approach control).
Air traffic controllers do not execute a series of sequential processes. Therefore, except at the detail level, you can not use a sequence based modeling technique (BPMN) to model such processes.
Actually, (and this is a big hush, hush, pitfall of BPMN), business systems - especially, complex business systems are notorious for being very non-sequential (except at the most detail level). But, keep this quite.
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