From the New Jersey Star-Ledger:

United Airlines confirmed today it has been subpoenaed and is cooperating in an investigation of flights by former Port Authority Chairman David Samson to his home in South Carolina.

The Port Authority received a subpoena last month seeking travel and other records related to Samson, in an investigation prompted by the September 2013 George Washington Bridge lane closures that has expanded in scope, NorthJersey.com reported Thursday evening.