Question to all the momma's who have traveled with newborn: we live in California while my fiance's family is in…

Question to all the momma's who have traveled with newborn: we live in California while my fiance's family is in Illinois. Were hoping that once the kiddo is born, to visit his family however I may not have the regular 3 months off of work since i don't qualify for fmla. I also talked to my doctor who said pediatricians recommend travel after 3+ months. So the question is when was the earliest you've traveled via plane with your newborn?