Dedicated freighter slots at Mumbai's city airport stand suspended until June next year, and cargo airlines moving to the replacement hub are finding Navi Mumbai International Airport (NMIA) is not yet ready to absorb their operations without friction.

The result is a double squeeze at India's largest commercial gateway. Mumbai City, the old airport, is operating under capacity restrictions while its airside infrastructure undergoes upgrades. Meanwhile NMIA, the new greenfield hub across the bay, is experiencing unexpected teething troubles as operators transfer cargo flights across.

Both airports belong to Adani Group. The conglomerate has spent months pressing airlines, ground handlers and forwarders to relocate cargo operations to NMIA, in part because the suspension of freighter slots at the city site leaves carriers little alternative.

For cargo airlines, the timing could hardly be more awkward. Any airline that kept flying freighters into Mumbai City now faces hard capacity ceilings. Those that made the switch to NMIA are encountering start-up problems that the operator had not fully anticipated — a familiar pattern for greenfield airport openings, but one that bites hardest when freighter networks have already been re-routed around it.

The commercial consequences ripple outward quickly. Freight forwarders booking capacity into and out of Mumbai must now weigh reliability risk at both ends of the market: a constrained legacy hub and a new facility still finding its operational feet. Where Mumbai cargo cannot land as planned, airlines face the choice of rebooking via alternate Indian gateways, trucking belly cargo overland, or absorbing delays — each option carrying cost and transit-time penalties that shippers ultimately shoulder.

Carriers with established freighter schedules into Mumbai carry the heaviest exposure. A suspended slot pool at the city airport until June removes planning certainty for roughly three quarters, a long horizon in air cargo, where seasonal peaks — from pharma to e-commerce — cluster tightly. Scheduling teams will need to decide whether to hold capacity in the market and accept disruption risk, or redeploy freighters to other Indian airports and reassemble road feeders into the Mumbai catchment.

For Adani, which controls both gateways, the episode tests its handling of a transition it has actively managed. The group has championed the shift of cargo operations to NMIA, and stakeholders will judge the new hub less on its terminal design than on whether freighter turnarounds, handling capacity and truck connectivity stabilise in the coming months. Teething problems at this stage are recoverable; a prolonged drag on freighter reliability would push cargo customers to build routings that bypass Mumbai altogether.

The concentration of both airports under one operator cuts both ways. It should, in principle, allow a coordinated transfer of cargo traffic and shared slot planning between the two sites. It also means a single decision-making chain governs both the restriction at the old hub and the readiness of the new one — leaving airlines and forwarders with no competitive alternative inside the Mumbai market itself while the transition runs.

What happens next depends on two clocks running in parallel: the pace of the airside upgrade work at Mumbai City, which determines when dedicated freighter slots can return, and the speed with which NMIA's operational kinks are ironed out. Until both align, cargo users of India's commercial capital should expect continued congestion, schedule variability and upward pressure on transaction costs across the gateway.