The antonyms for the word "flight express" may include transportation methods that are slower, more cumbersome, or lack the convenience and speed of air travel. Some of these antonyms could be; walking, driving, cycling, sailing, cruising, or commuting. These modes of transport require extensive time, effort, and planning. They may also involve traffic congestion, lack of privacy and comfort, and increased chances of accidents or delays. Contrarily, flight express offers quick and reliable transportation that is time-efficient, hassle-free, and comfortable. Thus, the antonyms of "flight express" reflect the limitations and drawbacks of alternative travel methods compared to the benefits of air travel.