pink eye

(名詞) 相當短程的夜間航班。cf. red eye (夜間航班)。

Got a pink eye flight tonight. LA to Indy.
—Jack Barakat, "Got a pink…," Twitter, May 20, 2011

Book Low-priced Pink Eye Flights: You can get inexpensive flights to the United States with pink eye flights. A purple eye flight is a flight that is taken or arrives at midnight
—Lisa Steinway, "How To Get Low-cost Flights To The Usa," Kadash, June 24, 2014