Why United Doesn't Need to Buy JetBlue: Blue Sky Is the Merger Without the Balance Sheet

At a Bernstein conference on May 27, United CEO Scott Kirby called the idea of buying JetBlue "idiotic." He went further on consolidation generally, ruling it out "for the foreseeable future." On JetBlue specifically: "The last thing I'm going to do is buy a route network that loses money."

The remark had a setup. In late February, Kirby pitched American Airlines on a merger. American shut it down in public — "not engaged with or interested," and a deal would be "bad for competition and for consumers" — and United dropped it. That left a theory in circulation: maybe American was never the real target, and JetBlue was the smaller deal United would settle for. That's the theory Kirby called idiotic.

He's right. Not because United doesn't want what JetBlue has. Because United already took it.

The deal United already has

A year ago, United and JetBlue announced Blue Sky. At its core it's an interline deal — the two sell each other's flights and check bags through on connections — with a slot swap and reciprocal loyalty on top. MileagePlus members earn and redeem on JetBlue; TrueBlue members do the same on United; elites get reciprocal perks on both carriers, live since the middle of this month. JetBlue gives United access to JFK slots for up to seven daily round-trips, starting as early as 2027, and takes eight Newark timings in return.

But it isn't a revenue pool. Each carrier keeps selling its own flights under its own code, and keeps its own books.

What a merger would also buy

Buy JetBlue outright and you get the things United wants in New York. JFK slots. United abandoned the airport in 2022 when it couldn't lock down long-term access, and Newark has been its only New York hub since. A feed of Northeast connecting traffic. A loyalty base to fold into MileagePlus.

You also get the things United doesn't want. A network that lost $602 million last year, at a negative 4% operating margin. Roughly 290 Airbus jets, including 59 A220s, a type United's mainline doesn't fly. A seniority-list integration, which is the slowest and costliest part of any merger. JetBlue's debt. And a near-certain fight with the Justice Department.

The wall the DOJ already built

The DOJ has drawn this line twice. In 2023, a federal court killed the Northeast Alliance, American and JetBlue's revenue-sharing tie-up in Boston and New York. The finding was a Sherman Act violation: two big competitors had agreed to stop competing where they overlapped. JetBlue walked. American appealed and lost at the First Circuit, and the Supreme Court declined to take it up. In 2024, the same DOJ blocked JetBlue's merger with Spirit. The last two attempts to bolt JetBlue's assets onto another carrier died in court. A United-JetBlue merger would concentrate New York harder than either one — the least likely combination to clear, not a convenient backup.

Blue Sky threads the needle. The Northeast Alliance pooled revenue. That made it an agreement not to compete, and that's why it lost. Blue Sky doesn't pool revenue. It's slots, interline, and loyalty, the kind of cooperation the DOT was willing to wave through.

Who carries what

This is partnership economics, and the split is lopsided. JetBlue flies its own metal, so United never absorbs the money-losing flying. No one pools revenue, so each keeps its own P&L — the feature that makes the deal legal in the first place. United takes the JFK slots, the Northeast feed, and the loyalty reach. JetBlue keeps the six-hundred-million-dollar risk. United extracts the value; JetBlue holds the liability.

A first step, or a substitute

A joint venture can be the first step toward a merger. When American and Alaska started talking this spring, that was the read — two carriers in the same alliance, complementary maps, little overlap, rehearsing an integration before filing for one.

Blue Sky is the other kind. United has said there's no merger coming. JetBlue is a distressed money-loser. The antitrust record makes a New York combination the hardest deal in the industry to close. So the partnership isn't a rehearsal for anything. It's the most United can get, structured so it never needs more.

Kirby's right that buying JetBlue would be idiotic. He just left out the reason. The pieces worth having are already flowing into United's network on an interline agreement — and it costs the airline none of the things that make JetBlue a bad thing to own.