Rainboe comes with a warning: toxic !
I've flown Jet2, no worse than any other low cost carrier, better than some, and I wouldn't have any concern about safety.
As for punctual, I don't expect any flight to be on time. When they are, I consider I've got a bonus - and that's most of the time. I factor in enough time for my next activity, whatever it may be, and if the flight's on time then I have time to spare for a cup of tea and a slice of Black Forest Gateau, to check out the totty, to sit in the sun, or to go for a walk or whatever pleasurable acitvity may take my fancy.