How far along?

Up to how far along can you be till u can't travel by plane? I have no complications with my pregnancy but I'm only 12 weeks and 6 days... Having to travel when I'm around 14-15 weeks... What's the risks? And had anyone traveled by plane that far along? Or when did u travel by plane how far along were you ? The travel is like 4-5 hours but stopping at two different places.