(Reuters) - Southwest Airlines said on Thursday it is recalling over 2,700 flight attendants from leave to support its summer schedule, ending a voluntary furlough program introduced during the coronavirus pandemic as travel demand waned. As more Americans become vaccinated, Southwest is among U.S. airlines signaling a recovery and trying to prepare for pent-up demand for domestic leisure travel. Last week, the low-cost airline said it had recalled 209 pilots from a similar voluntary leave program. Both recalls take effect on June 1. The Dallas-based airline said it still has other employees participating in the voluntary extended time-off program, including 800 pilots.