Originally Posted by
vrbaba
I am trying to book LGA to ORD, and for the day I am checking, every flight has availability, however the online tool only shows me the first 12 options. I want the flight later in the night, which is about 4 flights after the last option shown. The options are in the order of departure time.
How can I get around this without calling?

What do you mean by "has availability"? Not every seat that is open for sale is also available using AVIOS. So it could be that there are free seats on the plane but you'll have to pay for them.