American Airlines flight 570 odd flight path

WTF? The govt has the passenger plane and isn't saying why. Recall a day ago the mysterious flu like illness in a different flight? Those testing positive for some unusual flu strain and other inconclusive results are still quarantined. Flu takes 2-3 days to manifest. You don't just suddenly get sick all at once on a flight like that. It happens after they all go home not knowing they're infected. Now this. Given its coming from Phoenix it's possible terrorists got a biological agent across the border and on a flight. Why else would a civilian flight be at a military base?