I suspect that this reflects Easyjet's greater dependence on the UK, whose economy is growing more slowly than the rest of Europe.
A headline higher growth rate has no direct correlation with disposable income and a higher propensity to fly, let alone yield.
#projectfear
Always remember easyJet is mature in their UK market presence, there are no untouched sweet spots that EZY have not already had a crack at in the UK market in the last 23 years of operations.