 Thunderbird 3 : a single @-@ stage @-@ to @-@ orbit spacecraft . Piloted alternately by Alan and John , with Scott as co @-@ pilot . 
 Thunderbird 3 : a single @-@ stage @-@ to @-@ orbit spacecraft . Piloted alternately by Alan and John , with Scott as co @-@ pilot . 
Thunderbird 3 : a single @-@ stage @-@ to @-@ orbit spacecraft . Piloted alternately by Alan and John , with Scott as co @-@ pilot .