After completing B.Sc in Airlines tourism for further studies you can go for MBA in  specialization travel & tourism, MBA in Aviation or as per your interest of field. MBA  is one of the job oriented programme which help you to grow & gain the knowledge for the corporate sector.

The entrance exam you can appear CAT, CMAT, MAT, XAT etc. to get admission in top B School for the programme. you can check other exams & its eligibility to apply with given below link.

Top MBA Entrance Exam

You can also check the top MBA colleges with given below link.

Top MBA Colleges

Good Luck!