| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| CYS (CHEYENNE RGNL JERRY OLSON FLD) | airport | United States | 41.16 | -104.81 | 6156 | 0 | |
| CYSB (SUDBURY) | airport | Canada | 46.62 | -80.80 | 1141 | 0 | |
| CYSC (SHERBROOKE) | airport | Canada | 45.44 | -71.69 | 792 | 0 | |
| CYSD (Suffield Heliport) | airport | 50.27 | -111.18 | 2525 | 0 | ||
| CYSE (Squamish Airport) | airport | 49.78 | -123.16 | 171 | 0 | ||
| CYSF (Stony Rapids Airport) | airport | 59.25 | -105.84 | 805 | 0 | ||
| CYSG (ST GEORGES) | airport | Canada | 46.10 | -70.71 | 893 | 0 | |
| CYSH (RUSS BEACH) | airport | Canada | 44.95 | -75.94 | 416 | 0 | |
| CYSJ (SAINT JOHN) | airport | Canada | 45.32 | -65.89 | 357 | 0 | |
| CYSK (Sanikiluaq Airport) | airport | 56.54 | -79.25 | 104 | 0 | ||
| CYSL (ST LEONARD) | airport | Canada | 47.16 | -67.83 | 793 | 0 | |
| CYSM (FORT SMITH) | airport | Canada | 60.02 | -111.96 | 671 | 0 | |
| CYSN (NIAGARA DISTRICT) | airport | Canada | 43.19 | -79.17 | 321 | 0 | |
| CYSP (MARATHON) | airport | Canada | 48.76 | -86.34 | 1035 | 0 | |
| CYSQ (Atlin Airport) | airport | 59.58 | -133.67 | 2348 | 0 | ||
| CYSR (NANISIVIK) | airport | Canada | 72.98 | -84.61 | 2106 | 0 | |
| CYST (St. Theresa Point Airport) | airport | 53.85 | -94.85 | 773 | 0 | ||
| CYSU (SUMMERSIDE) | airport | Canada | 46.44 | -63.83 | 56 | 0 | |
| CYSW (SPARWOOD ELK VALLEY) | airport | Canada | 49.83 | -114.88 | 3800 | 0 | |
| CYSY (SACHS HARBOUR) | airport | Canada | 71.99 | -125.24 | 282 | 0 | |
| CYSZ (STE ANNE DES MONTS) | airport | Canada | 49.12 | -66.53 | 71 | 0 |