BAs A319 reliability is excellent. There are a few repetitive teething problems as its a relatively new aircraft with the V2500 engines, but most either sort themselves out in time (eg packs slow to come on line) or just require a quick reset of a circuit breaker. Technical delays on despatch are few and far between and when things go wrong its usually just a computer that needs swapping. As for the quick turnarounds its exactly as 52049er states. We regularly do 25 minute turnarounds or less, with the critical path (so to speak) getting the cleaners & caterers off so the pax can board, or loading the holds. Belt loaders are nice but not necessary as I've seen a couple of stations just back a flatbed truck up to the hold and lob the bags in. Airstairs were fitted to our original 320s so perhaps they could be ordered as an extra for the 319? The flight deck itself can be fully prepped and programmed by one person in under ten minutes with ease. Squeezing 156 pax on shouldn't even be difficult. The BA aircraft are certified up to about 147 pax. If you put charter seats in and deleted the forward wardrobe and galley 156 should be easy, plus you'd have 3 lavs to boot! On top of all that its a comfortable aircraft to fly with a spacious, well thought out, quiet flight deck, two proper jump seats that you don't have to build yourself.