Fly with shiba

Hi everyone! Im going to fly back to San Diego from Boston(6hrs flight) in 2 months. My shiba is currently 5 months old and im sure shes gonna get bigger. I just got the bag today and tried it. I wonder if she would still fit in the next two months.

Im kind of nervous. I would appreciate to hear your experience, how old when you flew with them, and if you have any pictures too.

I would love to hear some advice as well. Thank you soo much!