racegirl3075,
For some of the planned ones, it was up to 2 months. If it's a last minute change due to a technical problem for example, you'll normally be told at check-in. The Arkfly are planned changes though as far as I know. The short haul configured aircraft aren't as bad as you imagine. Remember, these were the norm for Thomsonfly up to 2008, it hasn't always been like that. First Choice (before the merger) raised the bar when they introduced Star Class in late 2005. I've been across the pond on them many times and although they are far from ideal, they weren't all that bad. You just had to get up and have a strech of your legs more often. Many of the scheduled airlines only offer 31" seat pitch on trans-atlantic services in economy. We're spoilt with 33"!
EDIT: Just looking at the ACARS log for TOM060 this morning, it's operated by G-OOBK, not PH-OYI
Darren