The 420K's envelope shape, fin design, and cable attachment points are further optimized for high aerodynamic stability and easy ground handling. While Lockheed Martin is the prime contractor for the 420K aerostats, the envelopes are built by ILC Dover.
The 420K's aerodynamic profile, fin configuration, and cable connections are tailored for superior flight stability and effortless terrain navigation. Under Lockheed Martin's direction as the main contractor, the envelopes are manufactured by ILC Dover.