Norwegian Air claims to be “on-track” to make cost cuts of two billion Norwegian krone this year.

The forecast came as the loss-making Scandinavian budget carrier reported the sixth consecutive month of revenue growth in September.

The airline, which carries six million UK passengers a year, saw revenue rise by 6% on the same month last year.

More than 3.3 million passengers were flown last month with an improved load factor up by 1.1 percentage points to 90%.

But the airline’s punctuality suffered as it was forced to lease in aircraft due to the ongoing grounding of Boeing 737 Max aircraft.

Less than 80% of flights departed on time in the month.

“The use of wet lease aircraft in September affected the on-time performance negatively,” the airline admitted.

Acting CEO and chief financial officer Geir Karlsen said: “As we are moving from growth to profitability, I am pleased that our unit revenue continued to increase for the sixth consecutive month and that passenger demand has been stable and solid.

“Norwegian’s operational performance continues to improve, and we are on track to reach the targeted cost-reductions of two billion NOK in 2019.”

He added: “The outlook going forward is promising, and for the upcoming winter season, we have adjusted our route portfolio and capacity to ensure that we are well positioned to meet the actual demand.”

Continued fleet renewal contributed to a further reduction of CO2 emissions in September with 70 grams per passenger kilometre, a reduction of 0.3% compared to the same period last year.

The carrier claims to have reduced its per passenger emissions by 30% since 2008.