I wish I had kept track of flights or held on to more boarding cards. Off the top of my head I could only reliably remember carriers and routes going back a year or two. My highly incomplete data is:

Airports
1 CDG Paris 28 19.7 %
2 EWR Newark 21 14.8 %
3 BUD Budapest 5 3.5 %
4 LHR London 5 3.5 %
5 NCE Nizza (Nice) 5 3.5 %

Airlines
1 Continental 18 25.4 %
2 Air France 8 11.3 %
3 SAS 4 5.6 %
4 Finnair 3 4.2 %
5 Vietnam 3 4.2 %

Aircraft
1 Boeing 757 5 7.0 %
2 Boeing 777 3 4.2 %
3 Boeing 767 2 2.8 %
4 Boeing 737 2 2.8 %
5 Airbus 320 2 2.8%