By Rich McKay (Reuters) -Six people were dead after two vintage military planes collided midair on Saturday and crashed in flames before a crowd of thousands who came to see them fly at a World War Two commemorative air show in Dallas, officials said on Sunday. No one in the crowd of 4,000 onlookers was hurt, and no names of the victims were released. “Authorities will continue working today on the investigation & identification of the deceased,” said Judge Clay Jenkins, the chief elected official in the Texas county. “Please pray for their families and all involved.” The crash involved World …