Not brilliant imo; zero legroom and quite narrow seats. Unfortunately the A300 falls into the same category as the B767; whereas scheduled operators fit 2-4-2(A300)/2-3-2(767) seating, the charter carriers squeeze 3-3-3 and 2-4-2 configurations into them.

Very uncomfortable on long haul.

Like you say, they manage to squeeze an extra seat in each row, so as well as not having any leg room, you have no space either side of you either.

Look at British Airways 767s as an example. They hold somewhere in the region of 250 passengers (correct me if I am wrong). Compared to Thomson/Britannia, I flew G-OYBI years ago I know that had 328 seats on it. Amazing how the same aircraft can have nearly 80 seats more.

If you’re not flown anything other than charter, it won’t be anything new. When you start flying with scheduled airlines, you’ll notice a difference.