An XC-142A first flew conventionally on 29 September 1964, and on 11 January 1965, it completed its first transitional flight by taking off vertically, changing to forward flight, and finally landing vertically.
The XC-142A made its first flight conventionally on 29 September 1964, and then completed its initial flight by taking off vertically, transitioning to forward flight, and landing vertically on 11 January 1965.