On Sunday, fifteen civilian aircraft entered a temporary flight restriction over the Chicago area that had been set up for President Donald Trump's nine‑hour trip to Illinois. The breach prompted the deployment of F‑16 fighter jets to escort the planes.
NORAD reported that warning flares were fired at two of the aircraft that failed to respond to instructions, while the remaining aircraft complied after interception.
The restriction was established to protect the president’s movements, and the incident marked an unusually high number of violations for the weekend, according to NORAD.