Random triples
| Subject | Object |
|---|---|
| gptkb:X-29 | completed successfully |
| gptkb:North_American_XB-70_Valkyrie | flight testing phase |
| gptkb:Northrop_Grumman_X-47_K | demonstrated carrier landings |
| gptkb:Northrop_Grumman_X-47_V | demonstration phase. |
| gptkb:Northrop_Grumman_X-47_E | operational testing |
| gptkb:Northrop_Grumman_X-47_N | completed testing phase |
| gptkb:X-59_Que_SST | flight demonstration phase |
| gptkb:X-29 | 1984-1999 |
| gptkb:Northrop_Grumman_X-47_A | operational testing |
| gptkb:X-47_P | operational testing phase |