Growing up in So.Cal.in the early '60s, we used to see them all. The XB-70, and several others. However, the one that transfixed us all was the X-15. You followed the X-15 by sound (sonic booms) and the vapor trails. Sonic booms also as it passed over us gliding back to to Edwards AFB. What a time to be growing up. :ARM34: - Lloyd BEERCHUG1