its too simple it fly by the third law of Newtons. Read and you can also try.
You should book the flights then you can fly in air and other option is that you can use para suits.I give the some travel trust able agencies.
www.dearflight.co.uk
www.robinflights.co.uk
You can flights fly in air to Bangkok from London simply visit below site:
http://www.dearflight.co.uk/cheap-flights-to-thailand/bangkok-bkk.aspx