I had travelled in multiple airlines:
India based airlines: (Mostly between Hyderabad & Chennai)
1) Indian Airlines
2) Air India
3)...
more... Indigo
4) Spice Jet
5) Jet Airways
6) Go Air
7) TruJet
8) Paramount Airways
9) Air Deccan
10) Air India Express
11) Kingfisher Airlines
International airlines:
1) Air India (Hyderabad to Delhi & Delhi to London)
2) Air Canada (London to Toronto)
3) Emirates (Hyderabad to Dubai, Dubai to Los Angeles; San Francisco to Dubai, Dubai to Hyderabad)
4) Lufthansa (Boston to Frankfurt & Frankfurt to Mumbai)
There are some more International Airlines that I had travelled in my childhood which I don't remember.