Today after my baseball tournament ended I decided to go spot at KSAT for a little bit. As I was pulling up to a service road which I use to spot I saw a United Max9 lining up on the runway. I quickly pulled out my phone (iPhone 11 pro) and snapped a photo of it after it had departed.
Here is that photo.
The flight is operating as UAL759 flying KSAT-KDEN. The tail number is N37504.
I very much hope to spot this the next time it flies into San Antonio.
Please feel free to give feedback on what I can do to make my pictures better next time.