The pilot has been flying planes ____ 20 years. The flight has been delayed ____ two hours. She has worked in the aviation industry ____ 2010. They have been waiting at the airport ____ this morning. The airline has been operating ____ more than 50 years. He has been a flight attendant ____ six months. We haven't had a safety incident ____ over a decade. The aircraft has been in service ____ it was delivered in 2015. Passengers have been boarding the plane ____ 20 minutes. The aviation engineer has been with the company ____ he graduated from college.

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