Thrombophilia travel by plane in pregnancy

Patient: Hello,Please help me with some advice for the following situation:I have a friend who is 11 weeks pregnant.She has thrombophilia and is being treated with aspirin 75mg.In the next period should make a flight out of country.Would like to know what risks she is exposed making this journey.Thrombophilia creates blood clots and she wants to know if there is a possibility to affect the fetus. She is exposed to any danger through this journey.Wait for your advice and thank you in advance for your response.All the best,Claudiu