I've been taking easyjet a fair bit recently back and forward to JER recently. Why? they have always been cheaper then BA. Having said that I'm flying BA back tomorrow and missing my easyjet flight on Wednesday. 4000 Avios and £7 for a one way isn't bad.
If BA start offering flight carnets for JER I may reconsider, but for a 35 minute flight, I have no issues with saving money and using my priority pass.