NEW YORK (AP) — Visitors to the museum at the national 9/11 memorial could be required to pay an entrance fee of about $20.That word comes from the president and CEO of the National September 11 Memorial & Museum, Joe Daniels.He said Thursday at a City Council hearing that visitors could be asked to pay a fee similar to those at other major museums in New York City.Family members of those lost in the attacks won't be charged. The entrance to the memorial itself will be free to everyone.Daniels has said he'd prefer that visitors not be charged. But he said the museum must generate enough income to maintain itself and the memorial. That money could instead come from grants or suggested-admission charges.