Airlines rushed to change their rules, to make a second crew member required in the cockpit at all times.
The move comes after a Germanwings plane was deliberately crashed by the co-pilot, Reuters reported.
The US already requires two crew members to be in the cabin at all times, but many other countries do not, allowing pilots to leave the flight deck, for example to use the toilet, as long as one pilot is at the controls.
Airlines including Norwegian Air Shuttle, Britain's easyJet, Air Canada and Air New Zealand all said within hours that they had introduced a requirement that two crew members be in the cockpit at all times.
Canada said it would immediately impose such a rule on all its airlines while those that already had such rules in place, including Ryanair, rushed to reassure customers.
Companies that did not announce such a policy change included Germanwings parent Lufthansa, whose CEO Carsten Spohr said: "I don't see any need to change our procedures here. It was a one-off case. But we will look into it."
This article was first published on March 28, 2015.
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