Diploma

Dear Swarna,
Yes, you can pursue Diploma in fashion from Visakhapatnam.

Hello Shubham,
I am afraid, lateral admission would be possible only in Maharashtra. Presently, only IITs are allowing Diploma as equivalent to class 12th. However, as you desired, I am attaching a link that will give you all the required information about top colleges offering Aeronautical Engineering.
https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/ranking/top-aeronautical-engineering-colleges-in-india/49-2-0-0-0&grqid=8g81uRjk&hl=en-IN

In India, if you need well recognized degree with lots of unique features and flexibilities you can go for Suresh Gyan Vihar University, which is Pioneer in Education for 22 Years, a NAAC Grade A accredited University and UGC - University Grants Commission AICTE - All India Council for Technical Education
DEB - Distance Education Bureau Recognized University for Distance education.

Now Diploma is an obsolete course in hotel management. You may plan for Bachelor's degree in HM or Diploma in aviation and tourism can be done, if not interested to apply for one more graduation.

Yes, you can get admission in aeronautical engineering in Rajasthan Technical University through Lateral Entry in Second Year i.e. is also called Direct Second Year. Diploma Students can get Direct Entry in 2nd year.
For more details about RTU check out the below link
http://www.rtu.ac.in/RTU/
Also, for information on Aeronautical Engineering and its Scope and Job prospects, click below
https://www.shiksha.com/careers/aeronautical-engineer-4
For top Aeronautical Engineering Colleges click below
https://www.shiksha.com/b-tech/ranking/top-aeronautical-engineering-colleges-in-india/49-2-0-0-0