You are correct. Please refer to the IRS publication 463 - http://www.irs.gov/pub/irs-pdf/p463.pdf - page 6
Special rate for transportation workers. You can use a special standard meal allowance if you work in the transportation industry. You are in the transportation industry if your work:
If this applies to you, you can claim a standard meal allowance of $52 a day ($58 for travel outside the continental United States) from January 1, 2007, through December 31, 2007.
Using the special rate for transportation workers eliminates the need for you to determine the standard meal allowance for every area where you stop for sleep or rest. If you choose to use the special rate for any trip, you must use the special rate (and not use the regular standard meal allowance rates) for all trips you take that year.