From Rolling Stone:
Originally titled “Midnight Plane to Houston,” the ode to long-distance romance from Mississippi songwriter Weatherly (who also wrote Knight‘s “Neither One of Us“) became the biggest hit ever for Gladys Knight and the Pips. Cissy Houston had an R&B hit with it first, before Knight took it to the top of the pop charts.
From allmusic, reviewing the album:
…a watershed in their history. …sophisticated soul at its best, Knight belting out numbers with great forcefulness and passion while the group provided delicate backup.