Aircraft de-icer firm Kilfrost has returned to profit following a period of major disruption to the global aviation industry. The historic North East manufacturer, which operates a Haltwhistle factory, reported operating profit of £1.2m in the year to the end of March 2022, a turnaround from a £235,000 loss the previous year. Turnover at the worldwide exporter increased from £9m to £14.9m during...