I do better with no communication with spouse, aside from email. As a parent your first concern is the welfare of your child and that he not be caught in the middle. As a mom you protect your child from negative influences. And we all know the importance of children getting their sleep.
Why not tell your son after he is fully awake and refreshed that daddy called before leaving on the airplane and wanted to talk to him. You fulfill your obligations to your little boy, he knows his dad wanted to talk to him and he can decide if he wants to call daddy.
It's a pretty dull way of handling a situation but seems to meet the needs of all.
