I'll be in Europe for the latter half of this year, so I've compiled my own quite ambitious list of all the interesting (to me) flights I'd like to do while there.
DeHavilland Tiger Moth - Numerous UK operators
DeHavilland Dove - Classic Air Force (UK) & LTU Classic
Douglas DC-3 - Dutch Dakota Association
Dornier 328 - Sky Work & Sun Air
Boeing 737-600 - SAS
Hanh Air Citation
DUS-
LUX
Fokker 100 - Austrian
Grumman Goose - European Coastal Airlines (not sure if possible in scheduled service)
Canadair CRJ-1000 - Brit Air
Boeing Stearman - Numerous UK operators
Junkers
JU-52 - Lufthansa Berlin Stiftung
Jetstream 41 - Eastern Airlines
Ilyushin Il-114 - Uzbekistan (still operating?)
PBY Catalina - Foundation "Exploitatie van de Catalina"
Garuda Indonesia 777-300
LGW-
AMS
Finnair Airbus A350
LHR-
HEL
Zeppelin - Deutsche Zeppelin-Reederei
Saab 340A
Yak-42 - Ihzavia
Yak-40 - several Russian operators
Antonov
AN-2 - unsure of an operator
McDonnell-Douglas
MD-87 - Danish Air Transport
Additionally, I have snagged the following on previous trips to Europe:
BAe ATP - Nextjet
Saab 2000 - Braathens Regional
Let 410 - Citywing (UK)
Fokker 50 - Cityjet
Avro
RJ - Cityjet
Fokker 70 - Austrian
BN Trislander - Aurigny
De Havilland Dragon Rapide - Classic Air Force, but numerous other UK operators
Europe is great for flying, lots of interesting aircraft and fifth freedom routes. This list is far from comprehensive and while not everything here is "old", I hope it is of some use to you
