E-6 Mercury TACAMO vs EC-135 / EC-18 ARIA
| American command-and-control aircraft, operative during the Cold War era, kept primarily for communications with U.S. nuclear forces. | |
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| Origin country | 🇺🇸 United States |
| Category | Military Special Mission Aircraft |
| Manufacturer | Boeing |
| First flight | 19 February 1987 |
| Year introduced | 1989 |
| Number produced | 16 units |
| Average unit price | $141 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 |