A plane from American Airlines Group Inc. prepares to land at New York’s LaGuardia Airport (LGA). Getty Images | Timothy Fadek | Bloomberg The travel boom, according to American Airlines, is expected to endure beyond this summer. According to a note to employees dated Thursday and reviewed by CNBC, the carrier has instructed the remaining 3,300 flight attendants on voluntary leave to return by November or December, and that it will begin recruiting new cabin crew members. “We require more flight attendants to operate the airline due to increased passenger demand and new routes starting later this year,” the note stated./nRead More