One should also remember that in the infinite wisdom of the Congress and whoever was President at the time, any cash salary over $1 million gets an extra tax on top of normal income taxes. Better to pay for his security in before tax dollars.
1) If he's already flying domestically and first class, that shaves what? An hour? Please.
2) The company doesn't have to charter a jet to fly friends and family.
So… let's just call it for the luxury that it is. They're not strapped for cash, after all.
(Besides, just how liquid is Mark Zuckerberg? He's only a billionaire on paper, right?)