Here are some example flight loads. These are not to bad. They have a connection in Denver in both directions. There are certainly routes that will be sold out but I think there should be seats if your little flexible.
Standby flight loads from PDX to MSP flights 2781 and 3151
- Flight 2781 August 1st holds 143 and has 54 unsold seats.
- Flight 3151 August 1st holds 143 and has 50 unsold seats.
Standby flight loads returning from MSP flights 335 and 1927.
- Flight 335 August 7th holds 143 and has 92 unsold seats.
- Flight 1927 August 7th holds 143 and has 64 unsold seats.