Under a wet lease agreement with British Airways, the new company will operate BA's existing premium transatlantic Airbus A318 service between London City Airport and New York JFK.
Allegiant Air says it will invest $50 million to add 16 seats to each of its MD-88 aircraft, bringing the seating capacity of these planes up to 166 from 150.
An IrAero passenger plane crashed near an airport in Russia's Far East on Monday morning, officials said, injuring 15 people but causing no fatalities.
Delta Air Lines this week launched the biggest expansion by any single airline at New York's LaGuardia Airport in 40 years, launching flights to 12 new cities, with another 14 set to take off in June.