Airbus, one of the leading planemakers in the world, has announced plans to postpone the delivery of 12 A380 planes to Dubai-based Emirates airline, the double-decker plane’s biggest customer, over the next two years.

The planemaker said it would step up cost cuts to minimise the impact of these delays, reports quoting a company statement said.

The delay stems from an agreement between Emirates and engine supplier Rolls-Royce Group Holdings, the statement was quoted as saying by Bloomberg.

Airbus said six deliveries of the A380 would be postponed from 2017 to 2018, with another six postponed from 2018 to 2019, following an agreement between Emirates and engine maker Rolls Royce and a consecutive deal between Airbus and Emirates.

Emirates had said in November it was having some unspecified technical issues with Rolls-Royce engines for A380 jets.