well scott, i hope that the poor girl on lgw yesterday is not reading this as i am sure that she will probably feel very hurt.
emirates have a grooming team who will take you aside and tell you if they feel that you have gained too much weight, i am sure that this must feel bad enough without writing about her on an international website! (It would be easy to identify the girl mentioned from your comments)
emirates like you to weigh in the normal BMI range. One of my batchmates at EK was ordered to gain weight because her BMI was in the underweight range. So it does work both ways!
At the end of the day I think that all airlines want people who are healthy and flatter the uniform, so amongthestars I'm sure that a size 12 will be just fine! Well it must be cos that's my size too and I work for EK and sit right in the middle of the ideal weight for my height range. Good luck and be healthy!