this, re kitty airlocks - having a glassed in porch made it so much easier to get in and out without letting Ariel out onto the road - she got out *once* in 10 years here, despite trying really hard, and then, when she did, she went about ten yards, and freaked out at the noise and slunk straight back in again (despite having free access to the back garden, so it wasn't the *outside* per se)