Can you clarify this a little? Have you seen or worked with ATC code? I can believe some of your other comments about poor API specs, old code, aging infrastructure, etc., but I'm curious about your loop and allocation comments. My understanding is mission-critical software often has very strict formal verifications and bounds checking processes it goes through, and one of the techniques in those conditions involves loop unrolling. The absence of loops doesn't (always) mean bad software if it's designed to save lives. Just wanting to understand this particular complaint.