Cruise stocks are trading as a single block, and the rally is giving Norwegian Cruise Line Holdings (NYSE:NCLH | NCLH Price Prediction) stock a lift it hasn’t enjoyed often this year. Shares of Royal Caribbean Group (NYSE:RCL) and Carnival (NYSE:CCL) are moving higher by similar margins, a pattern that points to demand reaching the entire industry. Norwegian stock trades at $15.55, up 5% as the session continues.

Also climbing, Royal Caribbean stock is at $286.41, a 4% gain that nearly matches the leader. Carnival stock is at $26.50, up 4% and keeping pace with its larger rival.

As a broad-market gauge, the SPDR S&P 500 ETF Trust (NYSEARCA:SPY) is up 0.7%. The Energy Select Sector SPDR ETF (NYSEARCA:XLE) is up 0.9%, and because fuel is one of the largest cost inputs for a cruise operator, the energy fund serves as a cost-side read on the group. Both funds trail the three cruise names by a wide margin, which makes the industry move stand out.

With shares of Norwegian, Royal Caribbean and Carnival all rising by similar amounts while both funds move far less, the session reads as a demand story reaching the whole cruise group. No announcement dated to this session explains the move in Norwegian stock.

Norwegian stock is down 30% year to date (YTD), and one strong gain barely reduces that deficit. In contrast, Royal Caribbean stock is up 4% YTD. Carnival stock is down 12% over the same stretch, a far softer loss that leaves Norwegian stock the clear laggard of the three.

All three operators run the same basic business, which makes the gap stand out. Across three brands, Norwegian Cruise Line, Oceania Cruises and Regent Seven Seas Cruises, Norwegian runs 35 ships with roughly 75,000 berths serving about 700 destinations.

Norwegian is also expanding Great Stirrup Cay, its private Bahamas island, and has 16 further ships on order through 2037, which would add roughly 43,000 berths.

Norwegian’s upside hinges on the newbuild pipeline and the private island, both built to lift onboard spending per passenger and give the company a revenue driver beyond filling more cabins.

However, 16 ships through 2037 is a long capital commitment for Norwegian, whose shares have fallen 30% this year. The same orders that support the company’s revenue case also fix its spending for more than a decade, which limits flexibility if the recovery runs longer than planned.

A 5% gain in Norwegian stock fits a group-wide move, so the durability of cruise demand across all three operators matters more than any single session. The question now is whether Royal Caribbean and Carnival shares keep moving in step with Norwegian stock, since a split would put the spotlight back on the recovery.

Norwegian’s recovery strategy, with its brand repositioning, revenue management and cost work, is the variable that could decide whether the stock narrows its gap with the larger operators, given its 30% YTD decline and the long spending commitment tied to its newbuild orders.

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