Shares of Dow component Boeing and the parent of its European rival Airbus slipped in European trading Monday after weekend reports that both companies were facing more delays for much anticipated aircraft.
Boeing shares fell 1 percent, despite the company denying that there were any changes to the schedule.
"There is no further delay. It is exactly what we announced in April. It is the same schedule, no further delay," a Boeing spokeswoman told AFP.
On Saturday, German newspaper Die Welt reported that Boeing signaled another 9-month delay in launching its new 787 Dreamliner, citing a letter sent by the company.
Last month, Boeing pushed the delivery of the Dreamliner to the fourth quarter of 2008 from the second quarter.
Meanwhile, shares of airbus parent EADS lost 3.8 percent in Paris trading.
The company is unlikely to deliver the 25 A380 super-jumbo jets it is scheduled to, Wirtschafts-Woche reported Sunday, citing a letter by CEO Thomas Enders to customers.