No of course the flight would not be shorter, but the discussion I thought was: can she fly out, drive to Smallville, and get back again before her night shift? if she leaves at 6 am, maybe not. if she leaves the previous night, yes.

"Hold on, my friends, to the Constitution and to the Republic for which it stands. Miracles do not cluster and what has happened once in 6,000 years, may not happen again. Hold on to the Constitution" - Daniel Webster