Last year Defence Minister Ursula von der Leyen took an Airbus A400M to Lithuania to show off the new transport aircraft, but engine trouble grounded it and forced her to return home on a decades-old Transall C-160 transporter. Then, as Merkel was speaking with reporters about the latest tensions between Russian Federation and the Ukraine, the door opened and a crew member asked her to come out.
"Why now?", Merkel asked. Several countries, including the US, Hungary, Austria, Israel and Poland, have said that they won't back the accord, to be approved at the conference in Marrakech.
The captain announced the plane's electronic systems had failed, rendering it unable to cross the Atlantic.
According to the CNBC, the airplane captain told passengers he had chose to land after the "malfunction of several electronic systems", but said there had been no security risk.
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Cologne-Bonn airport has a military base called Cologne-Wahn that is adjacent to the civilian airport.
She was due to arrive in Buenos Aires at around 2100 GMT - without her husband Joachim Sauer, who after the plane troubles opted to skip the event. It was not immediately clear which bilateral meetings would have to be rescheduled.
The talks with Merkel was not the only cancelled meeting, as earlier the United States administration cancelled a meeting with Russia's President Vladimir Putin.
It's not the first time for German officials were left stranded.
"It was a serious malfunction", Merkel told reporters hours later, after the delegation was brought to a hotel in Bonn.