The jet age was never sustainable, just temporarily feasible. What began to transpire isn't an industry in transition, but one in its death throes. The physics are merciless:
It's a fuel sink: a single Boeing 787 burns through 5,000 gallons of jet fuel to cross an ocean. That's the energy equivalent of:
- 50 years of bicycle commuting.
- 400,000 smartphone charges.
- 12 American households' entire annual electricity use.
And there's no replacement. Not biofuels, they require farmland that doesn't exist. Not hydrogen, it needs cryogenic tanks too heavy for flight. Not batteries with energy densities fifty times lower than kerosene.
Airport infrastructure is crumbling: modern airports are petroleum palaces built on three unsustainable pillars:
- Runways that require constant resurfacing with asphalt, which is an oil byproduct.
- De-icing fluids derived from ethylene glycol that's fossil-fuel-based.
- 24/7 operations dependent on cheap energy for lighting, baggage systems, and climate control.
When maintenance budgets shrink by just 20%, the dominoes fall fast:
- Overnight closures become permanent.
- Regional airports revert to grasslands.
- Even major hubs contract to skeletal operations.
Look at what occurred at Venezuela's Simón Bolívar International Airport, once a Latin American hub, it had to contract by mothballing 80% of its gates. This is the future.
Within the hierarchy of economic survival, what remains will be unrecognizable:
1. Military & state aviation: The last planes flying will be government-owned surveillance drones, diplomatic transports, and the private jets of whatever oligarchy emerges.
2. Island chains & remote routes: Alaska's bush pilots flying Cessnas on synthetic fuel will outlast Delta's transcontinental routes. The Maldives may keep one functioning airstrip as a lifeline.
3. The great scavenging: Abandoned airports will become:
a. Solar farms; where panels can be guarded.
b. Refugee camps; see Athens' old Hellenikon Airport.
c. Scrap metal bonanzas; aluminum airframes are valuable.
Cultural Consequences of the psychological impact dwarfs even the transportation loss:
- Global tourism collapses to pre-1950s levels.
- "Food miles" become irrelevant because only ships and trains move bulk goods.
- The diaspora experience ends; migration becomes permanent relocation.
The grandchildren of frequent flyers will stare at boarding passes in museums, struggling to comprehend how ordinary people once casually crossed continents in hours.
There's no soft landing, *pun intended*: the airline industry's current fantasies: sustainable aviation fuels (SAF) made from imaginary feedstocks, hydrogen planes needing entirely new infrastructure. These delusions are the death rattle of an era. When the collapse comes, it will be sudden:
- One year: "Capacity adjustments" and reduced meal service.
- Next year: Entire airlines folding mid-contract.
- Then: The last commercial 737 touching down forever.
This isn't pessimism, it's thermodynamics. We built a civilization that assumed petroleum would always be cheap and plentiful.
4.1c. Last Moving Parts
The arteries of globalization are hardening. The great engines that once moved mountains of goods across continents now wheeze and shudder, their lifeblood of cheap energy running thin. What comes next will not be some sleek, electrified version of business as usual, but a violent contraction to movement patterns not seen since the age of steam and sail. This is not a future scenario, it is already unfolding in the cracks of our creaking infrastructure.
The freight trains that stitch continents together are becoming the walking dead of industrialization. Even the most efficient diesel locomotives gulp 200 gallons per mile when hauling their massive loads, while electrified routes face their own slow collapse. India's 30,000 kilometers of sagging catenary wires whisper of maintenance budgets that can no longer keep pace with entropy. In France, the vaunted TGV network quietly cancels services during power shortages, its high-speed dreams buckling under energy realities. Across the Atlantic, America's freight cars groan into middle age, their average lifespan now stretching past 30 years; a statistic that would be merely nostalgic if not for the vanished industrial capacity to replace them. The future of rail will not be bullet trains or double-stacked containers, but a grim return to the 19th century: coal and grain corridors kept barely alive for extractive industries, passengers pushing stalled commuter cars like Zimbabwe's makeshift "push-pull" trains, and the great scrap rush as abandoned lines are picked clean like the bones of Congo's colonial railways.
On the high seas, the leviathans of container shipping, those floating cities burning 150 tons of bunker fuel daily, are already becoming anachronisms. The math is as brutal as it is simple: each new megaship requires 10,000 tons of steel, an energy investment equivalent to 50,000 barrels of oil. The Suez and Panama canals, those artificial chokepoints of global trade, grow more vulnerable by the year to climate disruptions and geopolitical strife. What emerges from the wreckage will not resemble our current just-in-time world, but something far more primitive: coastal tramp steamers chugging between neighboring ports like the "Kettle Bottom" coal boats of yore, rusty barges with jury-rigged sails struggling to harness the wind, and the floating graveyards of obsolete megaships repurposed as offshore warehouses or desperate refugee housing; a transformation already underway in Bangladesh's shipbreaking yards.
Even ferries, those humble workhorses once seen as transitional solutions, face their own reckoning. Alaska's state ferry system crumbles under $600 million in deferred maintenance, while electric alternatives prove viable only for the shortest urban crossings. Forty percent of U.S. ferry terminals have outlived their designed lifespans, their pilings rotting quietly beneath the waterline. The survivors will be those serving needs too fundamental to disappear: river crossings where bridges remain impossible dreams, archipelagic trade carried by Indonesia's traditional pinisi boats that require no formal ports, and emergency lifelines when roads fail, as Puerto Rico learned after Hurricane Maria.
A new hierarchy of movement is emerging from the chaos, one that would feel familiar to our great-grandparents. Human and animal power already moves more freight globally than airlines: half of Africa's rural transport still depends on donkey carts. Trade patterns are reverting to 18th century norms, with rivers and coastlines reclaiming their historic role as primary transport corridors. A handful of strategic rail lines may endure for military and energy needs, but the rest will fade into obsolescence.
This great unraveling will not announce itself with dramatic collapses, but through a thousand quiet retreats: disappearing timetables like Italy's 12% reduction in regional trains, shipping contracts defaulting as HMM's near-collapse foreshadowed, and islands like the Azores slipping into logistical isolation with just one monthly cargo ship. The COVID supply chain crisis was merely a tremor before the earthquake. The infrastructure of our energy-rich glory days cannot be maintained in the energy-poor future we've created. The machines are slowing down, and soon, they may stop altogether.