According to Wingx, an aviation intelligence company, business jet flights jumped to 18,900 a week in the first three weeks of May, from just 12,600 weekly in April. While the numbers are still far short of normal (last year’s weekly average was 50,100), the turnround is striking. By comparison, scheduled services were still falling in the first three weeks of May, down to 71,000 from 81,500 weekly in April and 500,100 a week in January.