Hummmmm a little ciphering tells me:
JFK isn’t that far from IAD
LAX and SFO are just up/down the coast from each other
MIA and MCO are in the same kingdom
But what do you file for your alternate when you go to DFW or DEN or ANC?
For bonus points what do you do when the cabin staff call forward and say they have the Little Old Lady (LOL) in seat 176Y in the middle of the aisle with the ADE out and you are over YYC?