The story with Bud being separated from the President while carrying the nuclear football is loosely based on a historical event. In 1973, President Richard Nixon presented Soviet leader Leonid Brezhnev with a Lincoln Continental at Camp David, Maryland. Brezhnev unexpectedly drove with Nixon off the retreat onto a highway, leaving Nixon's Secret Service personnel behind and separating Nixon from the military aide carrying the football(and his security detail) for nearly 30 minutes.
The story with Bud separated from the President while carrying the nuclear football happened in real life. Former President Bill Clinton left a NATO summit in his motorcade leaving behind his military aide . The aide had to walk the half-mile back to the White House.
When Harm is picking up the priest at Kansas City Intl Airport, the scenery does NOT match anything in that vicinity.