When Harry Met Sally first brought this issue to my attention:

Harry Burns: You take someone to the airport, its clearly the beginning of the relationship. That's why I have never taken anyone to the airport at the beginning of a relationship.
Sally Albright: Why?
Harry Burns: Because eventually things move on and you don't take someone to the airport and I never wanted anyone to say to me, How come you never take me to the airport anymore?
Sally Albright: It's amazing. You look like a normal person but actually you are the angel of death.

There's something wonderful about getting off a plane and having someone give you a big hug. Very "Love Actually"!

Do you drive your SO to (or from) the airport when they have a flight?