I have flown with DS1 several times but he has always been a lap baby. Now we are travelling this summer and had to buy a ticket. Those who have done this, did you bring on their carseat and fasten them into this or just the regular lap belt. I am not sure what we will do. DH and I are both flying, which is good and it is a direct flight, so it may not be that big of a pain to bring his carseat. Thoughts?