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[NadaHappyCamper]

What is the difference betwwen grade A and AA pertaining to eggs?

[Exapno Mapcase]

How to Buy Eggs (http://www.ams.usda.gov/howtobuy/eggs.htm)

There are three consumer grades for eggs: U.S. Grade AA, A, and B. The grade is determined by the interior quality of the egg and the appearance and condition of the egg shell. Eggs of any quality grade may differ in weight (size).

U.S. Grade AA eggs have whites that are thick and firm; yolks that are high, round, and practically free from defects; and clean, unbroken shells.

U.S. Grade A eggs have whites that are reasonably firm; yolks that are high, round, and practically free from defects; and clean, unbroken shells. This is the quality most often sold in stores.

U.S. Grade B eggs have whites that may be thinner and yolks that may be wider and flatter than eggs of the higher grades; the shells must be unbroken, but may show slight stains. This quality is seldom found in retail stores.

[Earthling]

Furthermore, the American Egg Board (http://www.aeb.org/facts/facts.html) has these recommended uses for each egg grade:
Grade AA
Ideal for any use, but are especially desirable for poaching, frying and cooking in shell.

Grade A
Ideal for any use, but are especially desirable for poaching, frying and cooking in shell.

Grade B
Good for scrambling, baking, and as an ingredient in other foods.