At the grocery store, I wear one on my back in the Ergo, usually the lightest one and the other would sit in the cart. I do park near a cart stall so I can get a cart and not have to worry about the kids. This winter tho, I am going to have to wear one and carry the other even tho they can both walk, walking through slush and snow isn't easy for a toddler. Lately tho, I go shopping at night after the twins are in bed. It's easier for me.
I don't have any advise for the airport tho, sorry. Hope you figure that out.
Lynn, wife to Jason SAHM to Nate, Riley and Jon