I have a hard time believing that you aren't contagious until you show symptoms. Seems when my kids were small, and 'building up their immunity' (ie, frequently sick with colds, etc.), I was always told that you were contagious before you had symptoms.
And, the gal on the flight did have a low grade fever, and knew it. She contacted the CDC and they told her to go ahead and fly. What a mistake that was.
But, selfishly, I'm glad she left Akron - my SIL is a DR at the leading Akron hospital!