04/09/2026
The etymology of "red-eye" is exactly what you'd guess. Bloodshot eyes, overnight flight, no argument there.
The bit that's less obvious is what it replaced. Before jets made a genuine overnight coast-to-coast flight possible, airlines in the 1940s and 50s ran something called "night coach," a slower, cheaper overnight service on propeller aircraft.
"Red-eye" only entered common use once jets made the flight fast enough that passengers actually experienced it as one continuous, sleep-deprived stretch rather than a long, gentle overnight journey.
The earliest record of the modern red-eye is American Airlines, 1969. Fifty-odd years later, the term hasn't aged at all, and neither have the eyes.