Do hypersonic planes exist?

Experimental hypersonic planes such as X-43 of NASA, X-51 waverider of Boeing have been tested. Commercial hypersonic planes do not exist as of now. You can read about the Hypersonic Technology Demonstrator Vehicle (HSTDV) – unmanned scramjet technology of DRDO in the given link.

Further readings:

1. Advanced Technology Vehicle – India, one of the 4 Countries To Develop Scramjet Engine
2. Reusable Launch Vehicle – Technology Demonstrator (RLV – TD)