Chancellor Angela Merkel missed the opening of the G20 summit in Argentina when her plane had to land shortly after leaving Berlin.
The plane with the crew of Mrs. Merkel returned on Thursday, because it flew over the Netherlands a communication error.
The Airbus made a safe but unscheduled landing in Cologne.
Mrs. Merkel flew to Madrid on Friday and then boarded a scheduled flight from Iberia Airlines to Buenos Aires.
Among their fellow travelers aboard the Iberia flight was Agustín Agüero, who tweeted a picture of the Chancellor aboard.
"Disruption of Multiple Systems"
On Thursday evening, the captain of Ms. Merkel's plane stated on board that he had decided to return to the "disruption" of several electronic systems. "
The aircraft's communication system collapsed and the crew had to use a satellite phone to contact air traffic controllers, reported the German Spiegel website.
It is believed that the problem was with an electronic distributor that controls both the radio and the dispensing of aviation fuel there was no danger to the lives of passengers at any time, emphasized a spokeswoman for Ms. Merkel.
The German Air Force denies that the plane's electronics could have been sabotaged. "There is absolutely no indication of a criminal background" said a spokesman.
"Overheated braking system"
An additional problem for that Airplane was that the longer runway of the Cologne airport was not available, added Spiegel. Since the A340 had to slow down quickly and was still full of fuel, the brake system was overheated and the fire department hit the plane on the tarmac.
The German delegation was left on the plane for some time before the officials decided to take a bus to a hotel in Bonn.
The Chancellor and a smaller delegation, including the Minister of Finance, traveled by air plane to Madrid on Friday morning before traveling to Argentina on an Iberian plane, a spokesman said.
Mrs. Merkel's husband was among those who were on the original flight in Germany.
Although there is a long-range government aircraft for long-haul flights, no crew was available, reported the German press.
The organization of an alternative route gave the German government a headache, as Ms. Merkel's entourage had to include several security guards.
Merkel misses important talks
The Chancellor missed the "family photo" at the start of the G20 summit, and officials tried to postpone planned bilateral meetings with national leaders.
Satirical Today's TV show tweeted a picture in which three other G20 leaders arrived next to an airport luggage hall, with the headline: "Merkel opted for an alternative arrival."
The Chancellor had talks with him on Friday President Donald Trump and China's Xi Jinping were due to arrive in Buenos Aires in the early evening.
In the midst of the ongoing crisis of the Russian occupation of 24 Ukrainian sailors, a spokeswoman in Berlin said that the Chancellor's meeting with Russian President Vladimir Putin would take place on Saturday. Proceed as planned. President Trump has canceled a meeting with the Russian prime minister.
The Airbus A340-300 affected by a technical failure is called Konrad Adenauer after the first postwar Chancellor of the Federal Republic.
For Finance Minister Olaf Scholz, the technical problems of the aircraft are nothing new.
In October he was on a trip to Indonesia when the aircraft was grounded because rodents had bitten by electrical cables during an annual meeting of the International Monetary Fund (IMF).
Last month, President Frank-Walter Steinmeier arrived late for a trip to South Africa because one of the aircraft's engines would not start.