F1 US Grand Prix race-weekend trip planner at Circuit of the Americas, Austin, TX (nearest airport AUS). One call returns the session schedule (practice / qualifying / race) + circuit venue intel (coords, airport, transit tips) + Open-Meteo weather + Duffel flights + Duffel Stays hotels. Travel enrichment activates when a single session is selected. Params: session (practice|qualifying|race|<session id>), origin, passengers, check_in, check_out, guests.

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