Delta Air Lines is offering travel credits to passengers on the Amsterstam-to-Detroit flight that a suspected terrorist tried and failed to blow up on Christmas.

Spokeswoman Susan Elliott told The Associated Press on Wednesday the carrier is notifying passengers about the vouchers. The amount wasn't disclosed.

According to authorities, a Nigerian man who said he was an agent for al-Qaida tried to blow up Northwest Airlines Flight 253 as the plane was preparing to land in Detroit on Friday. It was carrying 278 passengers and 11 crew members.

Delta, which bought Northwest in 2008, is expected to obtain a single operating certificate from the FAA by Thursday, which would allow it to put its code on Northwest flights and phase out the Northwest name.