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Low-cost carrier Norwegian saw passenger numbers rise by 13% in June to more than 2.8 million but departures were hit by strikes and bad weather.

Less than 70% of flights departed on time. Several factors affected the on-time performance in June, including weather-related challenges and several strikes.

“The strike among French air traffic controllers severely affected the traffic in Europe, while a fuel strike in Norway affected our operation in Scandinavia,” the airline said.

The increase of 317,821 passengers from the same month last year came as the load factor improved by 2.2 percentage points to 90.2%.

Chief executive Bjørn Kjos said: “We are grateful that so many choose to fly with Norwegian and we will work hard to maintain our customers’ trust.

“Today’s traffic figures show a solid load factor across all markets.”

The carrier took delivery two Boeing 737-800s in June as part of a plan to introduce 21 new aircraft this year.