Her office says Mrs Merkel and delegates made a safe, but unscheduled, landing in Cologne after the aircraft developed a technical problem.
Guido Henrich, commander of the German Air Force's government fleet, told reporters the pilots experienced the radio failure over the Netherlands and that other systems failed too, so they landed at Cologne-Bonn airport. Last year, Merkel was delayed on a trip to Egypt because a windshield heater malfunctioned.
There were few early signs of trouble on board the flight, aside from a frozen video screen that would normally show the plane's path.
The latest embarrassing glitch for the German military forced Merkel to instead take a commercial flight from Madrid to Buenos Aires with a vastly reduced delegation and miss scheduled talks with several world leaders.
READY TO PUBLISH - George HW Bush, a life in photos
Following his presidency, the Bushes relocated to Houston , Texas, where they settled down and became active in the community . Iraq, led by Saddam Hussein, invaded Kuwait after accusing it of stealing oil and conspiring to influence oil prices.
Trump wants to ban transgender people from the army via the court
One of the lawsuits against the Pentagon policy has made its way to an appeals court, the San Francisco-based 9th U.S. However, the subject matter seems to be without precedent, meaning it's ripe for a Supreme Court review.
North Atlantic Treaty Organisation calls emergency meeting with Ukraine on sea clash
Poroshenko wrote on Twitter that he declined to impose martial law for 60 days to avoid affecting residential election campaigns. The passage has also reportedly been blocked by a Russian tanker ship with no indication of when it will move.
The Airbus A340 government aircraft carrying Chancellor Angela Merkel and the German delgeation to the G20 summit in Buenos Aires.
Merkel will now travel to the G20 with a vastly slimmed-down delegation. Putin warmly welcomed the chancellor, invited her to breakfast and asked about Merkel's further plans within the summit. It was not immediately clear which bilateral meetings would have to be rescheduled.
Merkel planned to meet with Trump, President Xi Jinping of China and Argentine President Maruricio Macri.
In October, it was grounded in Indonesia after rodents gnawed through electrical cables during an annual meeting of the International Monetary Fund (IMF), German news agency dpa reported.