I had that happen once, cold came on just as I was planning to leave for Jamaica. If you've got a 'cough', and you want to avoid spewing on fellow flight passengers (very noble and considerate of you), I would go see a dr. and get some cough syrup with codeine ..... that seems to be the sure fire medication (for me anyway) to calm a cough. At this late of date, you might need to visit an emergency med-center - explain your situation, usually the docs at the med-centers are a little more reasonable about handing out 'scripts. I have also found relief from sitting in a nice hot sauna .... I'm not sure if it's because it induces an 'artificial' fever and works to kill the virus, or if it's just that it breaks up the phlegm and reduces congestion......NOTE: I'm not a medical doctor, and I don't play one on t.v. ....... but I have found relief from both these measures. Also, on a positive note, when I got to Jamaica with a cold ..... I felt better within the first 24 hrs of being there - the magic cure!!