I have a different opinion. I would let her know NOW that there is a slight chance that your husband will not be home, and if so you CANNOT wake your children and get them out of bed at 4:30 AM. Tell her that to be on the safe side, she should budget for a shuttle or cab ride to the airport, and if you are feeling particularily generous, you could offer to split the cost. The other option is to priceline an airport area hotel for the night before.
This is exactly what I would do! I would tell her now, "DH may be out of town at the end of the week, and if he is, I won't be able to take you to the airport because the kids are still sleeping at that time, so you'll need to plan on possibly taking the airport shuttle."
You don't even want to know what my kids would be like if you woke them at 4:00 a.m. or so!


You sound like a nice person. A car service is the way to go!