The Airbus A320neo will make its first flight on Sept. 25, Airbus Chief Operating Officer, Customers, John Leahy told delegates at the ISTAT Europe conference in Istanbul Monday.

Leahy says the aircraft is planned to take off at 10.30 a.m. local time from Toulouse’s Blagnac Airport, weather permitting.

The aircraft has been undergoing final ground and taxi tests over the past few weeks. Reports of issues discovered during engine testing cast doubt on the aircraft’s ability to get airborne this month, but Leahy’s announcement indicates that any issues have been cleared up.

The A320neo is to enter revenue service in the fourth quarter of 2015.

Leahy also presented updated performance data for the A320neo. Airbus predicts the aircraft will burn 20% less fuel per seat than the current A320 by 2019. That compares to an earlier target of 15%. The extra 5% stems from a higher maximum passenger number, 189 compared to 180 with the Space Flex design that rearranges the rear galley area, and a performance improvement package offered by Pratt & Whitney. 

With the same additional elements included, Airbus anticipates the A319neo to reach a 19% improvement over its predecessor and the A321, up to 23%.

Airbus has raised the A319neo  maximum seating capacity from 156 to 160 seats, the A320neo will go from 180 to 189 seats, and the A321 will be capable of holding 240 passengers, up from 220.