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© Rita Nicholas-King / LockheedRaptor tail number 4183 is seen being delivered to the U.S. Air Force on Nov. 15.
Lockheed Martin's F-22 Raptor production line is back on track after the U.S. Air Force's fleet-wide grounding of the jet had disrupted deliveries to the service, the company said.

"We are delivering jets," said Lockheed spokeswoman Alison Orne. "The last one delivered was 4185. 4195 will be delivered in late spring 2012."

Tail number AF 09-4185 has technically been delivered with the signing of a DD-250 form, but the stealthy fifth-generation fighter is currently undergoing government flight tests. After the completion of the tests this week, the Air Force's 1st Fighter Wing will fly the jet to Langley Air Force Base, Va., where it will be based.

"It is scheduled to depart for Langley on Dec. 8," Orne said.

The final Raptor to be built, AF 09-4195, will be delivered to Joint Base Elmendorf-Richardson in Alaska, where it will fly with the 3rd Wing. It is expected to be delivered in spring 2012, according to Lockheed.