United Airlines will have its first international premium economy cabins in the air during the summer, chief revenue officer Andrew Nocella said. 

The product, called Premium Plus, won't be available for sale until late this year or early next year, Nocella said at the carrier's earnings call Wednesday.

But they'll debut on aircraft in the summer, with seats available as upgrades.Thus far, United hasn't provided details on the width of seats and the space between rows in Premium Plus. 

Nocella said that the cabins would be rolled out on the same schedule as the United Polaris business class pods.

United unveiled its first Polaris seats in February 2017, but to date has only 24 aircraft equipped with the pods. The rollout is now in full force, however. Nocella said that United would introduce a Polaris plane every 10 days through 2020. 

On Wednesday, United reported net income for the first quarter of $147 million, up 48.5% year-over-year. Revenue was $9.03 billion, up 7.2%.

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