I thought you only got in trouble with nesting in the same city twice, such as, say you live in SEA, and want to spend this friday and next friday in Chicago.

I think you're supposed to book like this-
SEA-ORD 4/20
ORD-SEA 4/21
and
SEA-ORD 4/27
ORD-SEA 4/28


BUt, if you luv2nest
SEA-ORD 4/20
ORD-SEA 4/28
and
ORD-SEA 4/21
SEA-ORD 4/27

Then you get in trouble, right? BUt if your eggs are in different nests, not the same pair of cities, it's OK, I think.