My son just turned 2 last week...meaning he'll be 2 years and 3 weeks when we fly next week. We purchased a seat for him...but do not want to bring his car seat with us. I'm a bit nervous that he won't want to sit still for takeoff and landing and he'll try to fight his way out of the lap belt. Question is...can we have him on our lap during takeoff/landing despite him technically being over 2? I know we can purchase one of those CARES restraints...but at $70...I'd rather just have him in our laps if he's antsie. Thoughts?