STORY: Airbus cut its main jet production goal on Thursday (February 16).
The planemaker blamed it on a dispute with Pratt & Whitney over engine supply shortfalls.
Investors sold-off after the announcement and shares were down more than 6%.
Airbus now targets output for its best-selling model - the narrowbody A320neo series - of between 70 and 75 jets a month by the end of next year.
It had previously predicted 75 a month next year, up from 60 now.
Thursday's public fall-out follows months of tensions between the firms.
It's over the allocation of engines and spare parts between aircraft assembly lines and the repair facilities where engine makers make most of their profit.
Airbus officials said Pratt & Whitney had reconsidered initial proposals around engine volumes and then - quote - "failed" to make a formal supply agreement.
Airbus CEO Guillaume Faury said the world's largest planemaker was 'dissatisfied' with the move.
He further warned Airbus would 'enforce' their contractual rights.
Pratt & Whitney parent RTX didn't comment, but the engine maker has said it is in constant dialog with Airbus.
The setback overshadowed last year's record profits for Airbus and led to what analysts called disappointing goals for this year.
Airbus predicted 870 jet deliveries, up from 793 last year, and adjusted operating profit around $8.8 billion.
The firm also reported a fourth-quarter adjusted operating profit of just over $3.50 billion, up 17%, and ahead of analyst projections.
