Good Question !
I fly probably 60 flights a year, and last night was a london to Bermuda leg.
The lady sat in front of me was indeed very nervous, but after reassurance from the cabin crew, she really enjoyed the experience !
As for Jet 2 ? All I can say it that I entrunst two of the most precious things in my lifto them a couple of times a year,my beutiful daughters. Now, ask yourself, would I do that if I had ANY concerns about their aeroplanes ?
Sit back, take a deep breath, it WILL be 100% fine, and come back and let us know how you get on !