Boeing chairman, president and CEO Jim McNerney expressed confidence in the company’s fix for the 787’s battery system and predicted the aircraft’s grounding will be lifted soon.

Speaking Thursday in Washington DC at the US Chamber of Commerce’s aviation summit, McNerney said Boeing has “a high degree of confidence in the technical solution we are testing right now with the FAA.” Boeing earlier this week conducted a test flight using a 787 fitted with its fix for the aircraft’s battery system.

Regarding when the 787 will be back flying commercially again, McNerney said it “will be sooner rather than later.” The worldwide Dreamliner fleet was grounded Jan. 16 after lithium ion batteries failed and overheated on two in-service 787’s within a 10-day period.