EADS shares plunged as much as 11.7 percent and touched 20 euros for the first time since the A380 wiring snags pushed the company into financial and management turmoil in the summer.
Debt rating agency Standard & Poor's warned it might cut its rating on EADS on the back of a profit warning and the delays.
Disarray in Europe's biggest industrial project rippled through aviation and beyond, as Dutch parts maker Stork warned of a revenue hit, EADS shareholder DaimlerChrysler said it would review forecasts and bankers predicted a drag on French trade.
Any redistribution of tasks also raises questions over the fate of $3.6 billion in reimbursable launch aid paid by European governments to help develop the A380. Airbus declined to say whether it would have to pay the money back if plants were shut.
[Edited 2006-10-04 18:34:40]