"Brad was a wonderful father to two young children, a beloved husband to a wife who is expecting another child, a loving son, and the most loyal and supportive brother I could have ever asked for," Bill Hasler said. "His influence in the lives of all of us who loved him is immeasurable, and our grief is indescribable."
National Airlines was based until recently at Michigan's Willow Run Airport, west of Detroit. It carries cargo both commercially and for the military, Kaufman said. She said the company employs about 225 people.
Summan had worked two-and-a-half years for National Air Cargo, said his wife, Rajnit Summan.
Rajnit Summan added she last spoke to her husband Sunday.
"I told him to be safe," she said.
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Joan Lowy reported from Washington. Associated Press writers David N. Goodman in Detroit and Elizabeth Campbell in Louisville, Ky., contributed to this report.