OSLO (Reuters) - Norwegian Air NWC.OL is asking bondholders for up to two more years to pay back $380 million of outstanding debt, in the loss-making airline's latest attempt to shore up its finances.

The company said on Monday it would pledge lucrative take-off and landing slots at London’s Gatwick Airport as security.

Norwegian Air is Europe's third-largest budget airline by passenger numbers after Ryanair RYA.I and easyJet EZJ.L and has shaken up the market with cut-price transatlantic fares. But its rapid expansion has left it with hefty losses and high debt.

It was forced to raise 3 billion Norwegian crowns ($335 million) from shareholders this year, and said on Monday its working capital had decreased in 2019, partly due to tighter industry rules on advance ticket payments.

It also said the worldwide grounding of Boeing's BA.N 737 MAX plane was lasting longer than expected, dealing another blow to its finances. Norwegian has 18 of the aircraft.

The company’s bonds, which mature in December 2019 and August 2020, will be extended to November 2021 and February 2022 if bondholders accept the revised terms. A bondholders’ meeting will take place on Sept. 16.

“What we are doing now is to make sure that we have sufficient liquidity for the next twelve months,” interim Chief Executive Geir Karlsen told Reuters, adding he expected to repay bondholders with cash on hand.

Norwegian’s shares pared early losses to trade down 0.9% at 1130 GMT.

“On the one hand, it is a bad sign that the company’s funds are drying up, but we knew by looking at the financials that this could be an issue,” said Sydbank analyst Jacob Pedersen.

“But it’s a good sign the company is doing everything it can to mitigate the issue and the financial troubles ... It is a fine solution to the issue. We have to see whether the bondholders will think the same.”

Co-founder Bjoern Kjos stepped down as CEO in July in a move some analysts said could make it easier to sell the airline after talks about a deal with British Airways parent IAG ICAG.L fell through in January.

Shares in IAG, as well as those of Ryanair and Wizz Air WIZZ.L, rose on Monday on speculation there could be more consolidation in a sector that has for months struggled with overcapacity, traders said.

In May, Ryanair boss Michael O’Leary predicted four or five European airlines were likely to emerge as industry winners.

FILE PHOTO: A Norwegian Air Boeing 737-800 is seen during the presentation of Norwegian Air first low cost transatlantic flight service from Argentina at Ezeiza airport in Buenos Aires, Argentina, March 8, 2018. REUTERS/Marcos Brindicci/File Photo

BOEING

Another problem for Norwegian is the grounding of Boeing’s 737 MAX jet since March following two deadly crashes.

“There is no visibility that we know of when the aircraft will be up in the air again. We are actually planning on not having the MAXs flying this year, in 2019,” Karlsen said in the interview, echoing recent comments from peers.

Norwegian said in July it expected the grounding to end in October and to cost it 700 million crowns in 2019.

Overall, Norwegian’s operating performance has improved since mid-July, but its working capital has decreased this year, the airline said on Monday.

It expects earnings before interest, taxation, depreciation, amortization and aircraft ownership costs (EBITDAR) of 6-7 billion crowns ($670-$782 million) in 2019 and higher earnings in 2020, the company said.

“Right now it looks like we will end up in the middle of that window, which means we have doubled EBITDAR compared to 2018,” Karlsen said. “So the underlying performance is definitely moving in the right direction.”

Historically, the company has relied on advance ticket payments by credit card, but tightened industry terms have made this more difficult. It said working capital was down by about 4 billion crowns versus the second quarter of 2018 as a result.