I think that pax would be better off purchasing a hot tea at Caribou Coffee or Starbucks prior to boarding because the airlines are under financial constraints to reduce costs and probably won't be in a position to add additional soy milk or UHT dairy products.
Also, I have a professional background as a chef and strongly caution against drinking any dairy products that have not been maintained under 41 degrees F prior to consumption.
If you need to drink 8 oz of milk or a dairy drink and can bring it or buy it at the airport you will at least know that you have it.
RC
[This message has been edited by Radiocycle (edited 06-24-2003).]