It's to establish what he does for a living, that he is acustomed to travling great distances for his job and that his worked for high profile people/government types.
We get the speech of how great he is from four eyes early in to the film, but it's good to get an impression for ourselves about who this guy is instead of just being told which is lazy.
It was largely unnecessary but featured some cool Schumacher slo-mo, as well as Cage being ultra-polite to his clients, which is funny to watch throughout the film because we know what a nut-bar Cage can be!