how is PAL Express and Philippine Airlines connected?
PAL Express:  After the acquisition, the airline was re-launched as PAL Express, operating some routes and slot assignments of its sister company Philippine Airlines until management decided to re-brand the carrier as a budget airline known as Airphil Express. Philippine Airlines: Philippine Airlines (PAL), a trade name of PAL Holdings, Inc. (PSE: PAL), also known historically (until 1970) as Philippine Air Lines, is the flag carrier of the Philippines.
carrier