He said, "A good chunk of the post-9/11 air patrols in North America were flown by allied aircraft."
The article says:
" Five NATO planes have arrived at Tinker Air Force Base in Oklahoma City, Oklahoma"
and:
"Most of the United States' 30 AWACS, based at Tinker, have been flying around-the-clock surveillance of U.S. airspace..."
In my opinion, the phrase, "a good chunk of" is dubious. In a few minutes of Googling, I could find no indication of how many missions (if any) those NATO planes flew.