The strike by mechanics cost Boeing 21 deliveries, the firm says

The firm said its revenues fell 4% in the three months to September to $12.63bn (£7.1bn).

Net profits more than doubled to $1bn - but only thanks to a sizeable gain from selling a subsidiary.

The core business of selling passenger jets had its worst quarter in a decade, delivering just 62 aircraft after a crippling assembly workers' strike.

Investors gave the figures a cautious response, and Boeing shares fell 2.5% to $65.39.

Rivalry

Both Boeing and its European arch-rival, Airbus, have been chasing a string of new orders from rapidly-growing carriers in China, India and the Middle East.

However, Boeing has found itself embroiled in a month-long strike by the International Association of Machinists, which only ended on the last day of September.

During that month the company said it lost 21 deliveries.