When watching US television news or reading US news articles there is this affectation where instead of saying:
"Spotify music-streaming service to launch in U.S. on Thursday" (CNN)
"Leading credit rating agency Moody's said on Wednesday that the U.S. government's impeccable credit..." (Fox)
The on preposition is missed out.
Is this just a peculiar US journalistic "news speak" shortcut or do American non-journalist writers write this way too?