First, 10 is way too short a number to be able to sift, winnow, and sort all the important and iconic aircraft over the last century or so without missing some important ones. Also, since the roles are so different for so many of them, I have no idea how you even rank them. Better to just have a list of some of the most iconic aircraft. Screw the ranking. Some notable exceptions, IMO, just off the top of my head:
PanAm Boeing 317 Cliipper flying boat
Aérospatiale/BAC Concorde supersonic airliner
de Havilland Comet first jet airliner
Douglas DC-3 Dakota transport
Ford Tri-Motor airliner
Supermarine Spitfire fighter
Messerschmitt Me109 fighter
Messerschmitt Me262 first true jet fighter
North American F86 Sabre jet fighter
Avro Lancaster heavy bomber
Boeing B17 Flying Fortress heavy bomber
North American B25 Mitchell medium bomber
Fokker DRI triplane
Sopwith Camel biplane
Boeing 707 jet airliner
Hawker Siddeley Harrier V/STOL jet fighter
Lockheed C130 Hercules transport
North American X15 experimental hypersonic rocket plane
Avro CF105 Arrow experimental jet fighter
de Havilland Beaver bush plane
de Havilland Twin Otter twin-engined bush plane
North American T6 Harvard trainer