There is no guess-work on this answer... it is clear from the Rulebook. Sometimes, BGG makes us very lazy...
After completing her Air Strikes, Yellow can continue with Step 2 of her turn.
Page 12 Spying:
During Step 2 of this turn, you may place your Workers on your opponents’ Buildings in addition to your own.
See also the example, which describes the player using her own buildings before using the spy action.
First, she uses her 4 Engineers on her two Factories, earning 3 Bombers, 3 Fighters, and $6. Then she places her last Engineer (a Contractor) on Red’s Mine to produce 2 Yellowcake. Finally, she places her last 2 Laborers on Blue’s University, which allows her to get 2 Scientists.