China's social credit system has blocked people from taking 11.14 million flights and 4.25 million high-speed train trips.

The numbers, from the end of April, were included in a report by China's state-run news outlet Global Times, but it is unclear what offenses those targeted in the travel ban have committed.

The social credit system is actually a collection of blacklists, of which there are more than a dozen at the national level. Each list is based on similar offenses — such as misbehavior on planes and trains, or failing to abide by a court judgment — and determines the punishments people face, from throttling internet speeds to blocking loans.

While it's not made clear which list has had so many plane and train trips blocked, a former official, Hou Yunchun, is quoted as saying the system needs to be improved so "discredited people become bankrupt."

The blacklist Hou is referring to most likely involves debtors and was created by the Supreme People's Court in an attempt to make people comply with verdicts and repay their debts.