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Boeing said on Thursday that a production issue will affect its ability to deliver a “significant” number of 737 Max jets, potentially exacerbating aircraft shortages for airlines around the world.

The aerospace manufacturer said a supplier had used a “non-standard” process when installing two fittings in the fuselage of certain models of the narrow-body jet, creating the possibility that it might not comply with specifications laid out by aviation regulators.

Boeing said the planes can still operate safely, but “the issue will probably affect a significant number of undelivered Max aeroplanes, both in production and in storage”.

The potential for delay will deepen headaches for Boeing’s customers, many of which would like to expand their flying schedules.