I agree about the spacious feel on the Airtours 330. I was on one last year. I actually felt more like I was on a ferry than a plane because of the downstairs toilets.

I understand the downstairs ‘module’ can be configured in a variety of manners. A shop for instance or a crew sleeping area, or just a relaxing “chill out” area for general use.

I flew an Aer Lingus 330 six months after Airtours and it had a more conventional cramped layout as described in the JMC experience.