Now there is a product that is ideal for traveling families. It's called Sit 'n' Stroll. It's a car seat that transforms to a stroller by simply pushing a lever. It's really cool because it's also FAA-certified, meaning it's ideal for plane flights as well. We have used this product to travel with our daughter all over the world and I definitely recommend this product.
Another cool thing about the Sit 'n' Stroll is that youcan easily convert the stroller to a car seat to easier transition your child from airport to taxi to train to plane, etc. The only downfall is that it only comes in blue and also it's only recommended for 40 lbs. and under.