E-4 NOAC vs EC-135 / EC-18 ARIA
| American advanced airborne command post, launched during the Cold War, extensively employed for national emergency operations. | |
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| Origin country | 🇺🇸 United States |
| Category | Military Special Mission Aircraft |
| Manufacturer | Boeing |
| First flight | 1 January 1980 |
| Year introduced | 1974 |
| Number produced | 4 units |
| Average unit price | $223 million |
| American electronic surveillance and relay aircraft, involved largely in Cold War and Space Race-era operations. | |
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| Origin country | 🇺🇸 United States |
| Category | Military Special Mission Aircraft |
| Manufacturer | Boeing |
| First flight | 1 January 1961 |
| Year introduced | 1968 |
| Number produced | 45 units |
| Average unit price | $150 million |