Of all the bungled projects, the Berlin airport is the biggest embarrassment.

NPR: Berlin's Airport Project Delays Shame Germans

The saga of Berlin's new airport has turned into a national joke and a source of humiliation for a people renowned for being on time.

NPR: Berlin's Airport Project Delays Shame Germans

Germany's largest daily newspaper, BILD, has called the situation surrounding Berlin's new signature airport a "disgrace for Germany, " and quoted several international reports on the problems with the construction process.

CNN: STORY HIGHLIGHTS

Berlin (CNN) -- The opening of Berlin's new international airport has been postponed again, officials said, in the latest of a series of setbacks that have led some in Germany to slam the project as a national embarrassment.

CNN: STORY HIGHLIGHTS

After landing at Berlin's Tegel military airport earlier on Tuesday, the Queen began her fourth state visit to Germany by being driven, with the Duke of Edinburgh, to the Schloss Charlotten presidential palace in a dual-fuel royal Bentley - a German-owned company.

BBC: NEWS | Europe | Queen honours war dead in Germany

The city of Berlin, which is partially financing the airport's development, is deeply in debt.

WSJ: Berlin's New Airport Is Racking Up Delays Even Before It Opens

Thousands of supporters crammed the airport in Johannesburg when she returned from Berlin last month.

CNN: IAAF urges caution over Semenya intersex claims

The once-bustling airport -- it was the site of the 1948 Berlin airlift that brought food to West Berliners after Soviets blockaded the city --closed in 2008 when a new international hub opened on the outskirts of the city.

CNN: Sites of Berlin's industrial past get a second life

The city of Berlin and the state of Brandenburg are the main parties involved in the construction of the airport, with the German federal government also footing part of the bill.

CNN: STORY HIGHLIGHTS