Customers expecting delivery of 787s soon include the UK's Thomson Airways and Norwegian Air Shuttle.

BBC: Boeing warns customers of 787 Dreamliner delays

Both Thomson Travel and Norwegian Air Shuttle, a budget airline, have been told to expect delays and are making contingency plans.

BBC: Boeing warns customers of 787 Dreamliner delays

The planemaker itself has already had to delay delivery of the plane to two European airlines - Thomson Airways and Norwegian Air Shuttle.

BBC: Dreamliner: Japan's ANA cancels more Boeing 787 flights

Indeed, in an effort apparently designed to calm concerns, one of Boeing's airline customers - Bjorn Kjos, chief executive of Norwegian Air Shuttle - has come out in defence of the plane, echoing the view that "minor problems" such as these should be expected.

BBC: Boeing 787 Dreamliner: The impact of safety concerns