From Net Doctor UK
Any pregnant woman flying after 24-weeks of pregnancy is required to have a letter from a doctor confirming that it is safe for her to travel. From the timing you've stated, you'll need one.
Some airlines will not carry women who are more than 32-weeks pregnant, but this is an individual decision on the part of the airline.
It's important that you speak to the airline to establish whether they have such a limit.
The main concerns about travelling in the later stages of pregnancy relate to the chance of delivering early and the lack of necessary care should it be required.
Pregnancy and labour can be dangerous and it is not always possible to foresee complications.
It is not possible to say whether or not you are likely to have your baby early, but certain circumstances make it more likely;
If a woman has had one pre-term labour she is at an increased risk of having another.
Having twins makes pre-term labour more likely.
Diabetes, excessive amniotic fluid, haemorrhage and infections all increase the risk.
Between five and 10 per cent of all deliveries occur before 37-weeks gestation.
If you are fit and well and have had a trouble-free pregnancy, the likelihood is that you will deliver close to your due date, but this cannot be guaranteed.
Speak to your GP or whoever has been looking after your care during this pregnancy and take their advice on when you should fly.
In general, try to avoid flying after 32-weeks.
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Her timing was tight and even moreso given the past history.
I wonder if she did have a letter from her doctor saying it should be ok to go away at this time?
In her place I wouldn't have travelled this far and to that destination, wedding or no wedding, but of course saying that helps no one now. Poor baby.