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| XNL-1 | XNQ-1 | XNS | XO | XOS | XP |
| XPLRS | XPNDR | XPOP | XQM-103 | XRCF | XRD |
| XRK-1 | XRL | XRM | XRP | XRQ | XRS |
| XRT | XS | XSB | XSF | XSM | XSM-73 |
| XSST | XSTR | XT | XTA | XTAL | XTC |
| XTE | XTM | XTR | XTX | XUV | XV-15 |
| XV-5 | XVERS | XVL | XVV | XW | XWB |
| XWF | XWS | XX | XYD | XYP | XYR |
| Y | Y/N | Y2K | YA | YACAB | YAF |
| YAFS | YAH | YAK | YAL | YANK | YAO |
| YAP | YAR | YARD | YAT | YATB | YB |
| YB-35 | YB-40 | YB-49 | YBA | YBFD | YBG |
| YBH | YBI | YBR | YBRA | YBY | YC-125 |
| YCF | YCIPTA | YCL | YCQ-1 | YCT | YCU |
| YD | YDA | YDC | YDD | YDG | YDM |
| YDMP | YDN | YDO | YDS | YDU | YDUW |
| YE | YEA | YEG | YEL | YEO | YEP |