Warren Buffett, the so-called Sage of Omaha, declared at the weekend that only a vaccine for Covid could cure the crisis hitting the world aerospace sector. Rolls-Royce, Meggitt and other UK engineers feel his pain. Berkshire Hathaway, his legendary investment company, had to take a $10 billion hit to the value of its Precision Castparts aircraft components business. As it happens, today was a session where the aviation industry did fairly well in the markets, with British Airways owner IAG up 5% and Melrose and Rolls-Royce both gaining more than 2%, but all have seen their stock get battered since Covid struck.