How does this mother perceive flying?  Maybe the reason for the trip  was not 
stressful but she is stressed because she is flying?  Did she use a  baby 
carrier or backpack that would put pressure on the breasts?
I would look at diet (we all seem to eat differently when away from home)  
and meds as other people have already suggested.  
Since she knows she is flying again in September she has time to build up  
her supply before that trip and then a dip in supply wouldn't be such a  
concern?  Maybe take fenugreek for a few days prior to flying?  
Is she willing to dx the mini-pill for the time being and see if that makes  
a difference?
Best of luck,
Christie Pillado
El Paso, TX

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