The organisers blamed "increasing costs and less demand" as the sector continues to struggle.
The presenter raised £7.3m by cycling 300 miles from Wales to Scotland on a Raleigh Chopper bike.
Makers of a new generation of European electric aircraft are struggling to raise money.
Bluesky has at times been the most downloaded app on the Apple Store in the days following the US election.
The platform said on Thursday evening that one million people had joined it over the previous day.
The platform said on Thursday evening that one million people had joined it over the previous day.
The Desperate Housewives star acknowledged most Americans were not as "privileged" to "get to escape".
The Desperate Housewives star acknowledged most Americans were not as "privileged" to "get to escape".
Music fans still have a chance to purchase standard tickets which go on sale at 09:00 GMT on Sunday.
Music fans still have a chance to purchase standard tickets which go on sale at 09:00 GMT on Sunday.