Government travel restrictions and low demand hit carryings by Norwegian Air in April.
The carrier, in the midst of a financial restructuring after dropping low cost long-haul routes last year due to the pandemic, operated just ten aircraft last month, mainly on domestic routes in Norway.
Monthly carryings of more than 59,000 increased by about 18,000 over April 2020.
The load factor of 42.2% was up 24 percentage points year-on-year.
Chief executive Jacob Schram said: “The pandemic and international travel restrictions continue to impact our traffic results when compared to the same period last year despite the percentage increases.
“However, as the reopening of borders in Norway and across Europe progresses, we are confident that we will continue to see a gradual increase in year on year traffic.
“We continuously adjust our operations to changes in demand.”