Factual error?

"Factual errors: Ryder makes a comment about the sphinx not being able to catch them at mach 5. Apparently referring to the heroes making an escape in the organization's corporate jet. Mach 3.5 is about the fastest a jet plane has ever traveled. In addition, this would be a military jet, not the private jet pictured shown in the movie."

They were a secret organisation, They wouldn't have or buy ordinary military or private jets. They probably designed their own jet that does reach mach 5 and disguised as a private jet so's not to attract atenttion.