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I want to use both my ATT router and my airport router separately. How do I do that?
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How to set your airport extreme up so it will work seperately as a DHCP server from the network it's attached to:

open airport utility
double click on the extreme basestation icon in the left column
choose internet from the tabs across the top
next to "connection sharing" choose a public IP address" instead of Bridge mode.  
apply the update and you will be warned of a double NAT error.  Select to ignore it and the extreme will update.

Now your airport is handing out 10.0.0 ip addresses and your ATT router is handing out 192.168 numbers and you have two separate networks in the home.  The airport will work at 802.11.n speeds and the ATT crappy router will only work at 802.11.g speeds. 

Remember you have changed nothiong on the ATT router so it should continue to work but later you can turn that off it you'd like.  Just not yet.  

Now if the ATT router is handing out 10.0.x numbers then this will not work but it's highly doubtful that's happening. 
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