The VATSIM community continues to evolve in realism and depth, bringing real-world aviation procedures into the virtual cockpit. Among these are terms that many pilots have seen on charts, flight planning systems, or heard during events with full airport procedures: EOBT, CTOT, and TSAT. Understanding these time-based terms not only enhances your realism but also contributes to smoother ground operations—especially during high-traffic events.

So, what do these terms mean?

EOBT – Estimated Off-Block Time

This is the time you plan to push back, as filed in your flight plan. On VATSIM, aim to be ready at your EOBT, accurate times help ATC manage departures smoothly.

CTOT – Calculated Take-Off Time

CTOT is the time slot assigned for your departure based on air traffic flow restrictions. It’s calculated by ATC or event tools to sequence aircraft safely. Plan your start-up and taxi to arrive at the runway in time for your CTOT, which is typically valid from 5 minutes before to 10 minutes after the assigned time (–5/+10 minutes).

TSAT – Target Start-Up Approval Time

TSAT tells you when you can expect pushback/start-up clearance. It’s issued based on ramp and taxiway availability. Don’t call for push before your TSAT, waiting helps prevent ground congestion.

Flying on VATSIM is about more than just IFR clearances and ILS approaches. When you engage with procedures like EOBT, TOBT, and TSAT, you’re stepping into the full pilot experience. Just as importantly, you’re showing respect for the time and effort put in by volunteer controllers managing complex traffic flows.

Whether you’re flying from Heathrow during Cross the Pond or departing Frankfurt on a Friday night, understanding these concepts allows you to better integrate into realistic, coordinated operations. It’s one more way the VATSIM community turns simulation into immersion.