United designing seats that recline into beds on smaller jets in search of a good night's sleep By: CNBC.com News August 22, 2018 at 06:00 AM EDT United is studying lie-flat, first-class seating on some Boeing 737s , the first U.S. airline to do so. Read More >> Related Stocks: American Airlines Gp Atyr Pharma Inc Boeing Co Delta Air Lines Jetblue Airways Cp