yes sir. my son just graduated this past Friday. we were at the airport with him at 0500. the airline should give you a pass to go back with him until his plane departs to his next destination.
Yes, my son left the very next morning around 5:00 am. Like Michael said, the airline allowed us to sit with him.
now thats a big hurry up and wait!!,
Right after PIR, my daughter was allowed "liberty" for 7 hours, and was on a plane in the early morning hours the morning after, heading for Pensacola. Her fiancé met her at the airport at 3 a.m. to give her her cell phone as she was not allowed to take it back onto RTC after liberty. Short answer to your question: absolutely!