| 21. | Surveillance and observation aircraft use radar and other sensors for battlefield surveillance, maritime patrol and artillery spotting.
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| 22. | The pilots of the 103d flew a wide variety of observation aircraft for the next 18 years.
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| 23. | To keep them out of trouble, Tex arranges for a small observation aircraft to take them up.
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| 24. | The American Expeditionary Force purchased 384 two-seat Strutter observation aircraft and 130 single-seat bombers from France in 1917-18.
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| 25. | Only two were constructed, with the second being accepted by the Navy for service as an observation aircraft.
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| 26. | Serial no . 61-2674 was converted to the first OC-135B Open Skies observation aircraft, reentering service in 1993.
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| 27. | It served as a training organization for aircrews that were transitioning from observation aircraft to North American B-25 Mitchells.
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| 28. | Aircraft assigned to the new group were upgraded to C-119 Flying Boxcars and U-10D Super Courier combat observation aircraft.
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| 29. | Allied aircraft were successful in keeping the skies clear for observation aircraft to photograph and to mark enemy positions.
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| 30. | Two army pilots died when their military observation aircraft crashed to the ground in central Thailand, police said Monday.
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