On 4-12-07 I spotted a foreign military aircraft at MSP while my flight was on its way to the runway. Tan in color, flag or insignia on it's tail. As we took off I tried to look to see where it was going, and I think it made its way to the HHH terminal ( or over towards it). It looked very close to a VC-10. I looked up some of the charters and diversions for that day and found nothing. Anyone have more information on this? Are UK Air Force flights at all common to MSP?