Flight not on departure page...

GWY3046 departed at 3:07pm eastern time from KBTL to KPIT. However, if you look at KBTL departures, it’s not listed eventhough it arrived at KPIT and has a flight track.

Why is this?

flightaware.com/live/flight/GWY3046

It does show up when I went to the BTL page.

It landed at KPIT at 3:46pm eastern time. As of 9pm eastern time, it STILL wasn’t showing up on BTL’s departure listing. I’ve noticed this a lot when “Airlines” come into or out of BTL. There seems to be a loooooooooong delay getting it to show on the arrivals/departures page.