If a U2 can set its own altitude on the transponder the other possibility here is that the flight operator set it to an incorrect altitude that appeared it was flying in the same airspace as commercial planes but not within standard corridors.
This would generate significant number of collision warnings, given how busy LA regional airspace is, and that in turn might have demonstrated a limit to the number of simultaneous collion events this new ATX system can handle.
This would generate significant number of collision warnings, given how busy LA regional airspace is, and that in turn might have demonstrated a limit to the number of simultaneous collion events this new ATX system can handle.
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