ATLANTA — Delta Air Lines Inc., which is in bankruptcy, announced plans yesterday to discontinue its discount carrier Song and incorporate Song's fleet into Delta's regular service.

Song will continue to fly as a separate brand until May 2006, Delta officials said.

After May, Delta plans to refit the single-class Song airplanes to include first-class seating to make the planes conform with Delta's regular service. The planes will gradually be repainted in Delta colors by next fall.

Joanne Smith, president of Song, has been named vice president of consumer marketing for Delta, effective immediately.

Atlanta-based Delta filed for Chapter 11 bankruptcy protection from creditors in New York on Sept. 14. Song filed for bankruptcy protection the same day.

Delta officials said there will be no layoffs directly from Song's elimination. Any reductions that do occur are part of the 7,000 to 9,000 job cuts Delta announced last month as part of its bankruptcy restructuring, a spokeswoman said.

Song was created in 2003 as a hip travel option for leisure travelers, with amenities such as increased leg room, preflight meal ordering and even a music service. It was designed to compete with JetBlue Airways Corp. and other low-cost airlines.