By Alwyn Scott

PARIS (Reuters) - Boeing's extraordinary effort to solve battery problems that hit the 787 Dreamliner early this year did not disrupt progress on other aircraft programs, which remain on schedule.

"It didn't slow down development," despite doing three years of work in three months to fix the problem of overheating batteries on the 787, said Boeing Commercial Airplanes CEO Ray Conner, speaking at a news briefing ahead of the start of the Paris air show which opens on Monday.

Conner said the company expects to deliver 11 or 12 787s by the end of the first half, counting from when the grounding of the 787 ended in April.

One 787 was delivered in January before the worldwide 787 fleet was grounded. Two lithium ion battery incidents aroused safety concerns with regulators, prompting the grounding.

Conner said Boeing was on track to deliver more than 60 Dreamliners this year, as promised.

(Reporting by Alwyn Scott; editing by Jason Neely)