A second A321neo is expected to join the fleet ... La Compagnie came up at $2,498 round-trip. Business Class on Delta was $8,174, while both United and American clocked in at $8,177.

The amenity was previously only installed in first class on Delta's Airbus A321neo planes ... luxe DeltaOne Lounges and sliding doors in business class, among other high-class perks.

Vistara introduced its first Airbus A321neo aircraft with 188 seats in three-class cabin configuration. Vistara the first airline in South Asia to offer fully-flat beds on narrowbody aircraft.