FILE PHOTO: People walk past an American Airlines logo on a wall at John F. Kennedy (JFK) airport in in New York November 27, 2013. REUTERS/Carlo Allegri/File Photo

CHICAGO (Reuters) - Allied Pilots Association, which represents American Airlines Group Inc pilots, said on Wednesday they were pleased with Boeing Co’s progress on a 737 MAX fix but warned that the certification process should not be rushed or fast-tracked.

“We are optimistic with the progress, but cautious,” the association said in a statement, adding that the fix should be fully vetted and take into account any further information from an investigation into an Ethiopian Airlines crash on March 10.

“We are looking forward to the return of the MAX, but only when all stakeholders are ready,” the association said.