PHOENIX (AP) -- Authorities have released the names of two of the four people killed when two small planes collided in midair and crashed in the desert 15 miles northwest of Deer Valley Airport. One of the planes was registered to Bird Acquisition LLC, which does business as TransPac Aviation Academy. That's a school for commercial pilots in north Phoenix. TransPac officials said Monday that two of its flight instructors were killed in Friday morning's crash -- 37-year-old Paul Brownell and 26-year-old Basil Onuferko. They said Brownell was TransPac's director of standardization and had been with the company since 2005 while Onuferko joined TransPac on May 20. The names of the two people who died in the other plane haven't been released. That single-engine plane reportedly was registered to an aircraft leasing company.