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United passenger David Dao is pulling out the heavy artillery Thursday as his lawyers and daughter get in front of reporters, and there’s a likelihood they will announce a lawsuit against United and the city of Chicago.

Dao’s daughter will speak to reporters at 10 AM CT, along with Dao’s lawyers. One lawyer is especially significant – Tom Demetrio, a renowned aviation lawyer who has handled scores of personal injury cases related to airline mishaps.

Demetrio – the former Prez of the Chicago Bar Ass’n – filed legal docs Wednesday, asking a judge to order United to retain all videos, cockpit voice recordings, passenger and crew lists, incident reports, police documents related to the incident.