NASA Searches for Replacements as 25 Astronaut-Training Jets Become Harder to Maintain

NASA needs a successor to the 25 aging T-38 Talons used for astronaut training and chase-plane missions, but it has neither selected an aircraft nor committed to a full fleet purchase. With support for the jets already becoming more difficult and upfront procurement funding limited, Johnson Space Center has opened a broad market-research effort to identify practical replacement options.

The agency is seeking information about existing, production or near-production high-performance jets capable of supporting Spaceflight Readiness Training. That wording is deliberately open-ended: NASA says it is not restricting industry responses to a particular performance class or aircraft design heritage. The immediate objective is to understand what the market can provide, how those aircraft could be supported and what acquisition arrangements might fit NASA’s funding constraints.

The T-38 has been part of NASA astronaut operations since the 1960s. Its role is not simply to give astronauts additional flight hours. High-performance flying exposes crews to a fast-moving operational environment requiring real-time decisions, disciplined coordination and workload management. NASA also uses the aircraft as chase planes, which accompany other aircraft during testing or specialized flight operations.

Any successor therefore needs to preserve a specific training environment rather than merely replace an old airframe with a newer jet. NASA wants two seats, dual controls, modern instrument-flight avionics and high reliability. The aircraft must support dynamic maneuvering, formation flying and cross-country navigation, with performance comparable to a modern jet trainer or light fighter. The ability for a pilot to qualify and operate from either seat is highly desired.

Those requirements place equal weight on aircraft performance and day-to-day usability. Established maintenance manuals, training documentation and a supportable parts system matter because a small NASA fleet cannot draw on the same scale of logistics as a large military operator. A capable jet with a thin maintenance network could impose disproportionate cost and downtime, particularly if specialized components or technical expertise are difficult to obtain.

That support problem is likely to intensify as the U.S. Air Force retires its own T-38 fleet in the 2030–2035 period. Although NASA operates the distinct T-38N configuration, the Air Force’s withdrawal will reduce the broader institutional base surrounding the Talon. As a major operator leaves the platform, parts availability, repair capacity and specialized knowledge can become harder to sustain for remaining users.

The Air Force is moving toward Boeing’s T-7A Red Hawk and is targeting August 2027 for that trainer to achieve initial operational capability. A full-rate production decision is not expected until January 2029. Those milestones help explain the approaching change in the T-38 support environment, but they do not mean NASA has chosen the T-7A. Its market research expressly invites aircraft from different classes and design backgrounds.

NASA’s proposed next step is intentionally small. The agency anticipates evaluating a limited number of aircraft over several years before considering any complete fleet transition. That program would examine operational compatibility, logistics, cost effectiveness and effects on astronaut training. NASA explicitly describes it as an evaluation, not a full fleet buy or replacement decision.

A multi-year trial would let NASA test more than headline performance. Evaluators could determine whether an aircraft fits existing flight operations, how much contractor support it requires, what training burden it creates and whether its actual availability justifies its cost. For a fleet of only 25 current aircraft, maintenance staffing and supply-chain arrangements can be as consequential as speed or maneuverability.

Funding is another central constraint. Because NASA has limited money available for an upfront purchase, it is asking industry about leases, lease-to-own agreements, barter and other possible arrangements. These structures could lower the initial acquisition barrier, although they would still need to account for long-term maintenance, availability and operating costs.

NASA expects to conduct flight operations itself while relying on contractors for maintenance. That split makes clear why the market survey is examining the complete support model rather than an aircraft alone: the eventual solution must deliver a jet, documentation, maintenance capacity and predictable availability as one workable system.

The process has only begun, and no replacement schedule or preferred successor has been identified. The next meaningful milestone will be a small-aircraft evaluation that shows whether a modern jet can reproduce the T-38’s demanding training value without carrying forward its tightening support burden.

By David Whitaker — Associate editor for AMI’s aerospace and drone systems desk, translating flight systems, aircraft programs, spaceflight, and UAV developments into accessible technical stories.