CSS to exclude first row in tables?

Hello,

I have a table with custom CSS applied to a specific column. I want to exclude the CSS from applying to the very first row.

For example: http://i.imgur.com/a2LXULN.jpg

This is the CSS:
.avia-data-table .avia-price2-col {text-align: center; max-width: 80px; text-decoration: line-through; color: red;}

I tried around with :not(:first-child) but I’m not sure if I’m doing it correctly.

Any ideas? Thank you.