LOT Polish Airlines provides a cheap premium economy option to Europe from multiple US gateways, but my experience was both hot and cold.
Hot Cabin, Cold Service: LOT Premium Economy (787-8) From Chicago
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LOT Polish Airlines to bring the Boeing 787 to Chicago O'Hare
READER REVIEW: LOT Polish Airlines B787 Business Class review
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Refund rack operator lot 787 8 premium economy attack Sightseeing
Flying a Month-Old Dreamliner: LOT 787-9 Business Class Review
LOT Polish Airlines and its North American network - The Points Guy