By Tim Hepher, Padraic Halpin and Tassilo Hummel DUBLIN/PARIS (Reuters) -Airbus on Wednesday firmed up record plans for a 50% hike in key narrowbody jet output as it gambles on a steady travel rebound led by the United States, where the European exporter plans to deepen its industrial footprint. The world’s largest planemaker reaffirmed existing plans to raise A320-family production to 65 jets a month in mid-2023 and confirmed tentative plans to go further by lifting monthly output to 75 in 2025, compared with around 50 a month now. Coming alongside a higher than expected first-quarter profit,…