Final answer:
Melinda's dad always takes a taxi to the airport to surprise her and show up before his time.
Step-by-step explanation:
Melinda's dad always takes a taxi to the airport because he wants to surprise her and show up before his time. In the passage, it is mentioned that Melinda was hoping her daddy might surprise her and show up before his time at the airport. Taking a taxi would allow him to arrive unexpectedly and surprise Melinda. This action shows his love and care for his daughter.