Norwegian Air Shuttle has overtaken IAG’s British Airways as the biggest non-US airline on transatlantic routes to and from the New York area, in the latest illustration of the low-cost carrier’s move into British Airways territory.

British Airways owner IAG has said a power outage that led to the cancellation of hundreds of flights last month probably cost it about £80m (€91.5m) in lost revenue and the expense of accommodating, re-booking, and compensating thousands of passengers.