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But Bombardier said Wednesday the CSeries is still expected to enter into service by mid-year 2014.

While the specific details behind the latest delay were not given, Guy Hachey, Bombardier Aerospace president, described them as “a few little upgrades” to the software in an interview at last week’s Paris Air Show.

But he said at the time, he expected them to be resolved within a day or two.

However, the company’s leadership team met Tuesday morning at Bombardier’s Mirabel, Que., plant to get an update on the program.

“They decided that it was better to take a few more weeks to finalize all the systems to make sure everything is okay, and to postpone the first flight by a few more weeks,” said Marc Duchesne, Bombardier spokesman, in an interview.

Mr. Duchesne said there was no cause for concern that the software issues may spiral and lead to further delays. While he would not give specific details about what the upgrades involved, he said it did not involve the plane’s “fly-by-wire” electronic controls.

“We don’t want to be more specific,” Mr. Duchesne said.

Bombardier has applied for a flight permit for the first flight from Transport Canada and ground vibration tests have been completed. But the software upgrades have pushed out other testing, including low- and high-speed taxi tests.

The news of the delay follows on the heels of a tough week for Bombardier at the Paris Air Show, where it failed to secure a single new order for its new CSeries.