The Viltgance is one of the Lindblum airships.
*SPOILERS*
It's one of the Lindblum battle ships. You see it briefly when you first enter Lindblum after running from the Black Walz through the South Gate, but the place you'll probably most remember it is during the Silver Dragon assault sequence, on disc 4, just as you're entering Memoria.
If you go to Lindblum and talk to a girl named "Marsha," she'll mention that her dad rides an airship called the Viltigance.
Here's an image.
Viltigance
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