A union has stepped up its calls for a public inquiry into offshore helicopter safety, after a watchdog highlighted fatigue concerns in a report.
Fresh concerns have been raised over safety standards among staff standing in for striking workers at Scottish airports.
Two further strike dates have been announced at Glasgow Airport which will take the industrial action into the summer holiday period.
Workers at two airports have begun the first of two 12-hour strikes in a dispute over pay and pensions.
ABERDEEN Airport has been rated the worst in Scotland for the fourth year in a row in the latest Which? survey.