Small aircraft operators in Canada have fallen into a trap of accepting too many safety risks — and it has to stop before more people are killed or injured, the Transportation Safety Board warned Thursday. TSB senior investigator Glen Whitney said so-called air-taxi operators — companies that carry fewer than 10 passengers in fixed-wing aircraft and helicopters, often in remote areas — don't flagrantly break regulations as a general rule. But over time, many have become complacent about the safe operation of their aircraft as they come under pressure to cut costs.