Kent, Wash.-based New Frontier Aerospace says it has put its 3D-printed Mjölnir rocket engine through a series of successful hot-fire tests, in preparation for an initial flight test of a hypersonic ...

Frontier Airlines is scheduled to introduce 22 new routes in the US, Caribbean, and Latin America in November and December – with introductory fares starting at $19. The carrier will introduce its ...

Frontier Airlines, the Denver, Colorado-based no-frills carrier appears to be targeting Spirit Airlines. Fares from Detroit as low Frontier adds new routes to and from Detroit Metro Airport with fares ...