About 70% of U.S. airline passengers are wary of traveling on Boeing’s 737 Max once the grounded airliner resumes flights, a new survey shows, but most will never know they’re on it.

The reason: Although airlines disclose the make and model of planes they use, more than 66% of people never check what kind of aircraft they’re boarding, according to data from 1,000 people gathered by the Swiss lender UBS.

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