| | | Number | Denomination | Description | Perforation |
 |
 | C1 | 5c | Plane Over Map of Canada | 12 |
|
 | C1a | 5c | Plane Over Map of Canada | Imperf. |
|
 | C2 | 5c | Mercury and Western Hemisphere | 11 |
|
 | C3 | 6c on 5c | Plane Over Map of Canada | 12 |
|
 | C3a | 6c on 5c | Plane Over Map of Canada | 12 |
|
 | C3b | 6c on 5c | Plane Over Map of Canada | 12 |
|
 | C3c | 6c on 5c | Plane Over Map of Canada | 12 |
|
 | C3d | 6c on 5c | Plane Over Map of Canada | 12 |
|
 | C4 | 6c on 5c | Mercury and Western Hemisphere | 11 |
|
 | C5 | 6c | Daedalus | 12 |
|
 | C5a | 6c | Daedalus | 12 |
|
 | C5b | 6c | Daedalus | Imperf. |
|
 | C6 | 6c | Seaplane Over Steamship | 12 |
|
 | C6a | 6c | Seaplane Over Steamship | Imperf. |
|
 | C7 | 6c | Airforce Training | 12 |
|
 | C7a | 6c | Airforce Training | Imperf. |
|
 | C8 | 7c | Airforce Training | 12 |
|
 | C8a | 7c | Airforce Training | Imperf. |
|
 | C9 | 7c | Canada Geese | 12 |
|
 | C9a | 7c | Canada Geese | 12 |
|
 | CE1 | 16c | Transatlantic Mail Plane | 12 |
|
 | CE1a | 16c | Transatlantic Mail Plane | Imperf. |
|
 | CE2 | 17c | Transatlantic Mail Plane | 12 |
|
 | CE2a | 17c | Transatlantic Mail Plane | Imperf. |
|
 | CE3 | 17c | Transatlantic Mail Plane with ^ accent | 12 |
|
 | CE4 | 17c | Transatlantic Mail Plane with ` accent | 12 |