CALABASAS, CA - JANUARY 27: In this handout photo provided by the National Transportation Safety Board, an investigator works at the scene of the helicopter crash that killed former NBA star Kobe Bryant and his 13-year-old daughter Gianna on January CALABASAS, Calif. - The company that operated the helicopter that crashed in Calabasas in January, killing Laker legend Kobe Bryant and eight others, is fighting back against lawsuits over the tragedy, filing a suit of its own contending air-traffic controllers are to blame for the crash.The suit, filed last week as a cross-complaint to litigation against Island Express Helicopters, contends the crash was "caused by a series of erroneous acts and/or omissions'' by a pair of air-traffic.