In a Lockheed Vega, Sir George Hubert Wilkins, who was knighted for his previous feat on April 15-21, 1928, and Carl B. Eielson make the first flight over Antarctica.
Pentagon Cancels $6B GPS Ground System Contract
April 20, 2026
The Pentagon has canceled its contract with RTX to field a ground segment to manage its most capable GPS satellites, a more than 15-year effort beleaguered by software development issues and cost overages.