We’ll cover how to pick up an IFR clearance both on the ground at an uncontrolled airport and while airborne. We'll also explore why the route you file isn’t always the route you fly, helping you better understand how ATC decisions are made. Additionally, we’ll discuss the reasons behind airborne reroutes: why they happen, when to expect them, and what factors contribute to these changes. Session type: Forum — Skyfarer is not affiliated with the Experimental Aircraft Association (EAA) or EAA AirVenture Oshkosh. This session is listed for informational purposes from the official AirVenture 2026 schedule. Times and locations can change during the event — verify on the official session page: https://events.rdmobile.com/Sessions/Details/3572274