The charge of attempting to discharge a passenger without valid permission or authorisation (namely Emiliano Sala on January 21, 2019) was put to the defendant - and he spoke to confirm his guilty plea.
A trial will take place in respect of count one, namely communicating information to endanger / likely to endanger safety of an aircraft, on January 18 and 19, 2019.
Henderson has pleaded not guilty to this charge.
I can't post the URL to the article but it's on WalesOnline