Recent research from South Korea has indicated that most cases of contagion happen in people's homes, when there is an infected family member who infects those living with him/her, often unknowingly. So, lock up nice and tight and hope for safety... Of course, unless you live alone in a hut in the middle of nowhere.
On the original topic - TUI seem to have resumed flights to the Canaries and the Balearics with the explanation that there are holidaymakers who are happy to spend 14 days in quarantine for the sake of getting away (presumably those who either work from home or don't work at all). However, how does this correspond with the recent change in travel advice which now also encompasses the islands? Or do they know something which we don't?