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10 Current Airlines ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☐ ☐ ☐ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☒ ☐ ☐ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☒ ☒ ☐ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☒ ☒ ☒ ☐ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☐ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☐ ☐
10 Current Airlines ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☐
9 Top 100 Airport Names ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☐ ☐ ☐ ☐ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☒ ☐ ☐ ☐ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☒ ☒ ☐ ☐ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☒ ☒ ☒ ☐ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☒ ☒ ☒ ☒ ☐ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☐ ☐
9 Top 100 Airport Names ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☐
8 Aircraft Parts ☐ ☐ ☐ ☐ ☐ ☐ ☐ ☐
8 Aircraft Parts ☒ ☐ ☐ ☐ ☐ ☐ ☐ ☐
8 Aircraft Parts ☒ ☒ ☐ ☐ ☐ ☐ ☐ ☐
8 Aircraft Parts ☒ ☒ ☒ ☐ ☐ ☐ ☐ ☐
8 Aircraft Parts ☒ ☒ ☒ ☒ ☐ ☐ ☐ ☐
8 Aircraft Parts ☒ ☒ ☒ ☒ ☒ ☐ ☐ ☐
8 Aircraft Parts ☒ ☒ ☒ ☒ ☒ ☒ ☐ ☐
8 Aircraft Parts ☒ ☒ ☒ ☒ ☒ ☒ ☒ ☐
7 Famous Individual Pilots (Last Name) ☐ ☐ ☐ ☐ ☐ ☐ ☐
7 Famous Individual Pilots (Last Name) ☒ ☐ ☐ ☐ ☐ ☐ ☐
7 Famous Individual Pilots (Last Name) ☒ ☒ ☐ ☐ ☐ ☐ ☐
7 Famous Individual Pilots (Last Name) ☒ ☒ ☒ ☐ ☐ ☐ ☐
7 Famous Individual Pilots (Last Name) ☒ ☒ ☒ ☒ ☐ ☐ ☐
7 Famous Individual Pilots (Last Name) ☒ ☒ ☒ ☒ ☒ ☐ ☐
7 Famous Individual Pilots (Last Name) ☒ ☒ ☒ ☒ ☒ ☒ ☐
6 Defunct Airlines ☐ ☐ ☐ ☐ ☐ ☐
6 Defunct Airlines ☒ ☐ ☐ ☐ ☐ ☐
6 Defunct Airlines ☒ ☒ ☐ ☐ ☐ ☐
6 Defunct Airlines ☒ ☒ ☒ ☐ ☐ ☐
6 Defunct Airlines ☒ ☒ ☒ ☒ ☐ ☐
6 Defunct Airlines ☒ ☒ ☒ ☒ ☒ ☐
5 Military Helicopters ☐ ☐ ☐ ☐ ☐
5 Military Helicopters ☒ ☐ ☐ ☐ ☐
5 Military Helicopters ☒ ☒ ☐ ☐ ☐
5 Military Helicopters ☒ ☒ ☒ ☐ ☐
5 Military Helicopters ☒ ☒ ☒ ☒ ☐
4 Airplane Manufacturers ☐ ☐ ☐ ☐
4 Airplane Manufacturers ☒ ☐ ☐ ☐
4 Airplane Manufacturers ☒ ☒ ☐ ☐
4 Airplane Manufacturers ☒ ☒ ☒ ☐
3 FAI-governed Air Sports ☐ ☐ ☐
3 FAI-governed Air Sports ☒ ☐ ☐
3 FAI-governed Air Sports ☒ ☒ ☐
2 Brothers Who Launched Flying (First Names) ☐ ☐
2 Brothers Who Launched Flying (First Names) ☒ ☐
1 Study of How Air Moves Around Objects ☐