The CEO of Delta Air Lines is objecting to plans by the Transportation Security Administration to allow small knives back on planes.

Richard Anderson's letter to TSA administrator John Pistole on Thursday says he shares the "legitimate concerns" of Delta flight attendants about the decision. He says allowing small knives will do little to speed up passenger screening - but adds risk for cabin staff and passengers.

Flight attendant unions have opposed the new policy, which goes into effect April 25. Flight attendants at Delta Air Lines Inc. are not in a union.

The new TSA policy also allows things like souvenir baseball bats and golf clubs on board as well. Anderson's letter does not address those items.