You can't fly past security. 1. According to Chinese laws, overdue loans are a breach of contract, which may lead relevant departments to take restrictive measures. 2. According to the provisions of Article 21 of the Anti-Terrorism Law of People's Republic of China (PRC), the public security organs have the right to require airlines to check the identity information of passengers, and can take corresponding measures against persons suspected of committing crimes. 3. The Administrative Measures for Civil Aviation Security issued by the Civil Aviation Administration of China also stipulates that the Civil Aviation Administration may take restrictive measures if passengers are found to be suspected of committing crimes or illegal acts. To sum up, the breach of contract caused by overdue repayment of online loans may lead to failure to pass the security check smoothly. It is recommended to pay off the loan in time to avoid possible inconvenience and legal consequences.

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Other countries or regions have similar laws and regulations to ensure aviation safety and prevent criminal activities. However, the specific laws and regulations may vary from country to country. If you encounter similar situations in other countries or regions, please consult relevant local departments or legal institutions for accurate information.