It was propped up by its main shareholder, Etihad, but the Gulf airline announced it was no longer willing to invest.
The loan cash is expected to last for three months, the government said, after which the airline's future is uncertain.
Against this background, Air Berlin said that it "has today filed to commence insolvency proceedings under self-administration at the local district court of Berlin-Charlottenburg, in order to continue with the restructuring process that is already underway".
Germany's Air Berlin declared opening of the bankruptcy procedure, the company said on Tuesday.
Lufthansa intends to conclude these negotiations successfully in due time.
Air Berlin chief executive Thomas Winkelmann states: "We are working tirelessly to achieve the best possible outcome for the company, our customers and employees, given the situation".
"In April this year, Etihad provided €250 million of additional funding to Air Berlin as well as supporting the airline to explore strategic options for the business", an Etihad spokesperson said in statement. The company, which has popular routes to Israel, is in negotiations with Lufthansa and other firms to sell off parts of the airline. It is also extremely costly for Etihad, hard on the heels of Alitalia's Jun-2017 entry into administration.
Travellers in Germany will suffer higher prices as a result of the "Lufthansa monopoly", Ryanair said in a statement.
Lufthansa shares were up 4.7 per cent at 20.59 euros. "Air Berlin must proceed with transparency and provide all important information".
Air Berlin runs flights to over 150 destinations worldwide but has been loss-making for years. Etihad, the United Arab Emirates' carrier, bought a 29 percent stake in Air Berlin in 2012 as a means of funneling European passengers through its Abu Dhabi hub. "If acquired, Air Berlin's Dusseldorf airport slots would likely be a valuable asset to Lufthansa while freezing new entrants out of the "full" airport, unless the German authorities require slots to be surrendered to new entrants".
It added that two members of the board of directors, who joined after being nominated by Etihad, had resigned.
An increased threat of rip currents and high surf will be possible Tuesday, but the rain and wind fields will stay well off shore. Check back with us at weather.com for the latest on this, and everything in the tropics this hurricane season.
The two tourists were fined almost $600 each but were permitted to leave the country with their tour group, police said. The 41-year-old, who is not yet identified ( internet sleuths get on it! ), suffered minor injuries in the 8:15 a.m.
Summary: "If Yogi Adityanath cannot take care of a medical college in Gorakhpur , how can he run the entire state?" he asked. A hospital in India has been accused of failing to provide enough oxygen after 60 children died on its wards in five days.
The meteorological department forecast that central and western plains were likely to receive heavy rainfall from this evening. The natural calamity that has affected the land and electricity in the rural areas of Nepal and killed around 56 peoples.
Citing recent United States sanctions and "adventurism", Tehran plans to bolster its ballistic missile system as tensions rise. Iran's Deputy Foreign Minister Abbas Araghchi said the bill passed on Sunday had the support of the government.
Joseph Dunford, chairman of the US Joint Chiefs of Staff, before their meeting at Cheong Wa Dae in Seoul on Monday. The latest tests led US President Donald Trump to warn of " fire and fury like the world has never seen".
Bet365 are showing a Caroline Wozniacki v Elina Svitolina live stream, legal and straight onto your computer via 101 Great Goals. The 27-year-old won the Rogers Cup in 2010 at Montreal, one of 25 titles over her impressive career.