There were lots of times when Clark jumped down (from a balcony at the Planet, from an airplane, from a helicopter) and changed in mid-air before catching Lois as Superman. I don't recall him ever jumping up from the ground as Clark and then changing in mid-air, though.

"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