The number of data requests fulfilled by Telegram skyrocketed, with the company providing data to U.S. authorities on 2,253 users last year.
The hackers gained access to the airport security police's payroll records and deducted small amounts from employee salaries.
More U.S. companies have been added to the list of telecommunications firms hacked in a wave of breaches by a Chinese state-backed threat group tracked as Salt Typhoon.
