At the core of the A-6 was DIANE, the Digital Integrated Attack/Navigation Equipment: a track-while-scan attack radar, a separate search radar, a ballistics computer and an inertial navigation system, all wired together. In an era when most attack pilots still bombed by eye in a dive, DIANE let the Intruder crew fly a low-level approach in cloud or darkness, have the computer solve the release point and drop unguided bombs with an accuracy nobody else could match at night.

The system was famously temperamental — early DIANE was maintenance-hungry and often only partly working — but when it worked it was revolutionary. It is the single reason the A-6 existed: not speed, not agility, but the ability to deliver ordnance precisely in weather and darkness that grounded everything else. Decades of upgrades, culminating in the A-6E TRAM with its turreted infrared and laser sensor, turned that promise into routine precision strike.

Unlike almost every other attack jet, the A-6 seated its two crew side by side rather than in tandem, with the bombardier/navigator’s seat set slightly lower and to the right. The reason was DIANE: pilot and B/N needed to share the same radar scope and work the attack together, and side-by-side seating let them do that and communicate by glance and gesture. It made the cockpit wide — part of the Intruder’s bulbous, stubby look — but it turned the two-man crew into a single weapons system.

Grumman’s original design gave the A-6 jet exhausts that could tilt downward to boost short-field and carrier performance. The feature was dropped early as unnecessary and heavy, and the fixed-tailpipe subsonic aircraft that entered service was slower and plainer than first imagined. It did not matter. The Intruder was never meant to win races; its job was to carry a heavy load a long way and put it on target in any weather, and the rugged, unglamorous machine that resulted did exactly that for thirty-four years.

Because the Intruder was a government-procured Navy aircraft built across three decades, no single tidy price exists. Period program figures put the flyaway cost of an A-6E in the low tens of millions of dollars — very roughly $30–43 million depending on year and how research and development is counted — and no reliable, officially published cost-per-flight-hour figure exists in open sources. Any exact dollar number attached to an A-6 should be read as an estimate rather than a sourced fact.