These are 4, 4.5, 4+, and 4++, depending on the source. Standard 4th-generation fighters include newer technologies and composite materials. The F-16 and F/A-18 are some 4th-generation fighters.

A NORAD fighter jet was deployed on July 5, to intercept a civilian aircraft that unlawfully entered restricted airspace over Bedminster, where President Trump was spending the holiday weekend.