New data from OAG shows domestic air capacity in China on routes under 800km has fallen 7% over the past decade, while total domestic capacity grew 65% as the country’s high-speed rail network expanded past 50,000km. The comparison, drawn from OAG Analyser schedule data for August 2016 and August 2026, measures two-way seat capacity across China’s domestic network and shows where airlines have concentrated growth as rail has taken share on shorter sectors.
The split by distance is stark. Capacity on routes over 800km rose 91%, from 36.9 million seats to 70.3 million, while capacity on routes under 800km fell 7%, from 12.9 million to 12.0 million. Total domestic capacity still rose 65%, confirming this is a reallocation of aircraft rather than a shrinking market.
| Route length | August 2016 (seats) | August 2026 (seats) | Change |
|---|---|---|---|
| Under 800km | 12,935,397 | 12,012,370 | -7% |
| Over 800km | 36,881,312 | 70,324,781 | +91% |
| All domestic routes | 49,816,709 | 82,337,151 | +65% |
Source: OAG Analyser, August 2016 vs August 2026, two-way seats.
The retreat is led by China’s largest groups. China Eastern has cut 815,800 seats on sub-800km routes (-31%), taking its short-haul share of total network capacity from 33% to 15.4%. China Southern has removed 797,100 seats (-37%), with its short-haul share falling from 23.9% to 11.1%. Regional carriers have moved the other way: China Express Airlines grew short-haul capacity 178% to 922,273 seats, and Chengdu Airlines grew 184% to 393,853 seats, picking up routes the larger groups have vacated.
Route-level data shows the same pattern. The steepest cut was Jinghong to Kunming, down 254,694 seats, alongside large reductions on Yinchuan to Xi’an and Lanzhou to Xi’an. The largest gains went to routes crossing provincial borders where flying still beats rail on journey time, led by Kunming to Chengdu, up 159,618 seats, and Lanzhou to Chengdu, up 82,827 seats.
China’s high-speed rail network passed 50,000km by the end of 2025, more than the rest of the world’s network combined, and the government plans to extend it to 70,000km over the next two decades. For airports built around short-haul domestic connections, that is a capacity planning problem before it is a traffic problem: the carriers that used to fill those routes are redeploying aircraft to longer sectors, not adding frequency back.
The implication reaches beyond China. Capacity planners elsewhere are watching the same dynamic as high-speed rail expands in Europe and the Gulf, which is part of why ACI World has been pressing governments to plan airport capacity years ahead of demand rather than react to it. It also sits alongside a domestic aviation market that, globally, is still setting records: ACI World logged 9.8 billion passengers in 2025, underlining that rail competition is reshaping where capacity goes rather than shrinking the total pool. Airports weighing their own long-haul capacity bets, as at Heathrow’s delayed third runway programme, are making a similar calculation about which routes retain a time advantage over ground alternatives.
For airports and route development teams with meaningful sub-800km traffic, the practical step is to model rail journey times into every route business case now, not after frequency starts to erode, and to flag multimodal rail-air integration as a commercial option rather than a threat to be absorbed.
