Guardian Jet Center, a one-year-old FBO at Ontario International Airport, Calif., has apparently outgrown its 24,000-sq-ft hangar and current terminal. The company recently broke ground for an additional 22,000-sq-ft hangar expected to be completed early this month. A larger terminal is expected to be built by early next year. Meanwhile, Stephen Lassetter, most recently with Houston-based Universal Weather & Aviation, was named president of Guardian Jet Center.