Just two months after unveiling plans to begin U.S. service to the U.K., JetBlue Airways Corp. moved to fly farther still, ordering 13 Airbus SE A321XLRs, the new, longest-range version of the popular narrow-body jet.

The order builds on JetBlue’s April decision to enter the hyper-competitive trans-Atlantic market in 2021, with flights from Boston and New York to London. The New York-based airline didn’t name potential new destinations, but said Thursday that the XLR would power service into south, central and northern Europe.

JetBlue is expanding its European ambitions even before testing the waters on its initial routes, where the airline will compete with entrenched global alliances and struggling low-cost operators that recently began crossing the Atlantic. It has yet to secure flight space and gates at a London airport.

The order for the XLRs, which debuted this week at the Paris Air Show, is valued at $1.85 billion before customary discounts. Combined with another deal for smaller planes, the JetBlue purchase has a list value of about $2.8 billion.

“The incredible extended range of the A321XLR allows us to evaluate even more overseas destinations as we think about JetBlue’s expansion into European markets plagued by high premium fares and subpar service,” Chief Executive Officer Robin Hayes said in a statement.

The XLR can fly 4,700 nautical miles, about 600 miles farther than the A321LR JetBlue ordered in May to support its initial trans-Atlantic routes. JetBlue is converting existing orders for Airbus A320neo aircraft into the XLRs, with deliveries starting in 2023.

JetBlue “will consider a number of options” in coming months for where to fly the A321XLR, said spokesman Doug McGraw. He didn’t say whether the carrier would evaluate European flights from other major cities in its network, such as Orlando and Fort Lauderdale, Florida.

The carrier on Thursday also announced an order for 10 smaller Airbus A220-300s, with a list price of $915 million. JetBlue ordered 60 of the model in July to replace its fleet of Embraer SA E190 aircraft. The A220s, which are more fuel-efficient, will be used in business markets like Boston, although JetBlue is evaluating possible cross-country flights.

The first A220 will arrive in 2020, with deliveries of the 10 additional jets starting in 2025.