Linea Peninsular's U.S. office will be closed on the following dates:
May 26, 2008     Memorial Day
July 04, 2008     Independence Day
Sept. 01, 2008   Labor Day
Nov. 27, 2008    Thanksgiving Day
Dec. 25, 2008    Christmas Day          

For U.S. Customs & Border Protection Closures:
2008 Federal Holidays

For Mexico Holidays:
Mexican Customs Page
and see below:
January 1st
First Monday of February
Third Monday of March
May 1st
September 16th
Third Monday of November
December 25th