Regulators and airlines on Thursday grounded nearly all of the world's 787 Dreamliner fleet until a fire risk linked to the plane's batteries is fixed, deepening a crisis for U.S. titan Boeing that threatens to last weeks.

Authorities in Chile, Europe, India, Japan and Qatar followed the lead of the U.S. Federal Aviation Administration in ordering a halt to all flights, after a Japanese Dreamliner on Wednesday was forced by a smoke alert to make an emergency landing.

The FAA, whose remit overseeing all U.S.-made planes extends around the world, highlighted "a potential battery fire risk in the 787" after a suspected leak emerged as the focus of inquiries into the aborted All Nippon Airways flight.

Analysts said the ANA incident, following a series of safety scares involving the Dreamliner, needed careful crisis management from Boeing (IW 500/16), which has made a bold bet with the next-generation plane.

The aircraft relies on battery-powered electronics rather than the hydraulics used in older planes. Boeing says its use of lightweight composite materials is a breakthrough for airlines anxious to cut fuel costs.

Boeing CEO Jim McNerney said the company "deeply regrets" the impact of recent events on airlines and passengers, and vowed to take "every necessary step" in concert with the FAA to resolve the problems.

McNerney: "We are confident the 787 is safe"

However, he stressed: "We are confident the 787 is safe and we stand behind its overall integrity."

He received support from what might seem an unexpected quarter on Thursday when the head of arch rival Airbus, Fabrice Bregier, told a press conference in Toulouse, southern France that he hoped to see the stricken aircraft back in the air soon.

"I wish all the best to our colleague," Bregier said. "A plane is designed to fly. Even if a good 787 flies we have good solutions to face it. I don't bet on the difficulties of a competitor."

As a result of the mishap on the domestic ANA flight, 46 out of the 50 Boeing Dreamliners in operation around the world have now been grounded.

United Airlines -- the sole U.S. carrier to fly the Dreamliner -- joined ANA and Japan Airlines (JAL) in withdrawing Dreamliners from service.

Air India and Chile's LAN Airlines followed suit, while LOT Polish Airlines -- the 787's only European operator for now -- was subject to a halt order from the European Union's aviation agency.

Qatar joined on Thursday by grounding its five-strong fleet of 787 aircraft, with chief executive Akbar Al-Baker saying it "will resume 787 operations when we are clear that the aircraft meets the full requirements of the Airworthiness Directive and our standards."

Arun Mishra, India's civil aviation chief, told AFP: "We will track the FAA enquiry into the Dreamliner. We can't say when we will allow it to fly again; it depends on when Boeing gives us satisfaction over safety concerns."

The only remaining airline still operating 787s is Ethiopian Airlines. But the European Aviation Safety Agency stressed that the ruling from the FAA, in Boeing's home market, should apply to all the jets worldwide.

Japan is home to 24 Dreamliners and the government in Tokyo said it was taking no chances pending an investigation into whether the lithium-ion battery on the ANA flight had overheated.

Lithium-ion batteries are widely used in consumer electronics such as laptops and mobile phones.

The powerful lithium-ion batteries used on the Dreamliner have emerged as the focus of concern in light of the ANA incident and another on a JAL flight in the United States last week, with smoke reported on both planes.

Electrolyte leaks and burn marks were found on the battery's metal casing, ANA said. Kyodo News reported that officials from the Japan Transport Safety Board were working on the principle it overheated.

Copyright Agence France-Presse, 2013