I fly only when traveling with my family. I only "specially" include a new airline if that does not hurt financially. Still, a decent list has developed with Motor Sich An140 as the highlight
Aerosur 722 LPB-SRE (old)
Air Nostrum A76 MAD-BJZ
Vueling 20N SVQ-BCN
Ryanair 738 WMI-LPL
City Jet CR9 CPH-VNO
Estonian 735 ARN-VNO
AirCalin 320 AKL-NOU
Easyjet 319 MAN-KRK
EasyFly A46 NVA-CLO
VivaColombia 320 BOG-BGA
Copa E190 BOG-PTY
Bangkok Airways 319 BKK-RGN
Hunnu F50 ULN (old)-DLZ
Alitalia 320 FCO-TRS
Norwegian 738 VNO-ARN
SAS 738 ARN-FRA
Avion Express 320 WAW-MAD (sadly replacing LOT's 734 which I was dreaming about)
StarPeru 732 TPP-LIM
Cimber CR1 VNO-CPH
Tiara Shorts 360 BON-AUA
Citilink 320 CGK-SUB (may not count because I have 8 more flights with Garuda)
Batik 320 UPG-AMQ (may not count as I have 22 flights on LionAir + Wings)
Merpati Xian MA60 DPS-LBJ
TAM 320 REC-FOR
Motor Sich An140 LWI-IEV
Windrose A76 KBP-IFO
Tiger 320 HBA-MEL (so disgusting. the only airline I would never ever fly again)
Vietnam 321 SGN-VDH
Indigo 320 CCU-JAI
Interjet 320 MEX-TGZ (was dreaming of an SSJ; alas...)
Aeromar A76 PXM-MEX
Myanmar National E190 RGN-HEH
Pacific Blue 738 AKL-TBU (does not count if we deem it to be part of Virgin Blue)
33 in total. when I started counting, I expected to get somewhere between 5 and 10 only...