An Australian judge rejected an appeal by former US Marine Corps pilot Daniel Duggan to avoid extradition to the United States, where he faces charges related to allegedly training Chinese military aviators.

Duggan, who previously served as a pilot in the US Marine Corps, is accused of illegally providing flight training to Chinese military personnel more than a decade ago. The specific details of the alleged training activities have not been disclosed in court proceedings.

The extradition case has moved through Australia's judicial system, with Duggan's legal team attempting to prevent his transfer to US custody. Thursday's ruling represents a significant setback for his defense efforts to remain in Australia.

The charges against Duggan stem from activities that allegedly took place over ten years ago, though the exact timeline and nature of the purported training have not been publicly detailed. US authorities are seeking his extradition to face prosecution in American courts.

The case highlights ongoing concerns about military personnel providing training or expertise to foreign militaries, particularly those of strategic competitors. Duggan's legal team may still have additional avenues for appeal within Australia's court system.