Traveling late in pregnancy after previous c-section.

I have a holiday booked from before we fell pregnant. I will be 30 weeks and it's an 8hour flight.

I flew in my previous pregnancy at this point with no issues but was asked to provide a doctor's letter saying I was safe to fly and pregnancy had had no complications.

My question is will they do a letter like this again for this pregnancy having had a C-section with my daughter? As long as no complications arise obviously, would they consider a previous c-section a reason to refuse late flying?

I am a candidate for VBAC if that makes a difference and will be hopefully trying for this.

Thanks