New research from Juniper Research says that more than 1.5 billion — or about 1 in 3 — boarding passes will be displayed on mobile devices like phones or tablets by the end of 2019.

That’s way up from just 745 million boarding passes that will be delivered on mobile devices this year, the firm estimates.

The study shows that mobile boarding passes are increasingly used by frequent flyers. But, Juniper says, leisure passengers are less likely to use them, owing to the fact that they’re less familiar with the technology.

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