Solution to 1: Looking for Recommendations 

Each of these are movies/TV series, which happen to share names with NASA space shuttles. In order, they are:

    
    
  • Discovery
    • 
    
  • Challenger
    • 
    
  • Atlantis
    • 
    
  • Endeavour
    • 
    
  • Enterprise
    • 


The missing one of course is the final space shuttle, and the answer.

COLUMBIA