I used to have a 3wheeled Steelcraft, before they brought out the Striders. I loved it. I ran with it and never had a trouble with it. I didn't have a climber in DD1 though. Also it was heavy. I've never seen a light 3 wheeler.

I currently have a Valco Zee. I love love love it. It weighs only 8kgs so is essentially a stroller but has all the attributes of a pram (minus suspension). Valco also make the Ion that really has 4 wheels but the two at the front are together making it like a 3 wheeler. It steers so so so easily and is also very light.

ETA we fly a fair bit too and I know I'd far rather my current pram at the airport than a big clunky 3 wheeler.