(For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window) April 9 (Reuters) - European stocks were subdued on Friday, but on course for their longest weekly winning streak in more than a year as hopes of a rapid recovery in economic growth offset doubts over the euro zone’s COVID-19 vaccination programme. The pan-European STOXX 600 index inched down 0.1% after hitting an all-time high at the open, while UK’s blue-chip FTSE 100 and Germany’s DAX slipped about 0.1% and 0.2%, respectively. London equities have outperformed this week, with the domestically focussed FTSE mid-cap index hitting a record high as Britain gradually emerges from a strict winter lockdown. Airline stocks including British Airways-owner IAG, easyJet and Wizz Air rose between 0.2% and 1.0%. Britain will confirm in early May whether it will allow international travel to resume from May 17. Travel company TUI fell 5.7% after saying it planned to offer convertible bonds worth 350 million euros to improve its liquidity position as the pandemic disrupts travel plans. Airbus rose 2% after the French planemaker reported slightly higher deliveries in the first quarter. (Reporting by Sruthi Shankar in Bengaluru; Editing by Shounak Dasgupta)