However, "excellent" in this context is not "perfect," since each time a process is context-switched it stops operating — which then results in throughput delays (and performance degradation).

Building more aerodynamic aircraft and operating them more efficiently (by reducing air-traffic-control delays, for instance) could produce about two-thirds of those savings.

Because the airline had to give everyone their money back after the delays, they now say they're operating in the red.