Say bon voyage by plane or bon voyage.

When going out for a trip or meeting, a friend sent a text message: "Bon voyage". Generally speaking, if you fly, you'd better say "Have a safe trip". Because the plane flies against the wind, the body can take off smoothly at an elevation angle with the airflow. If the wind is downwind, the plane may crash, just like eating fish by boat can't turn the fish over, because turning the fish over can be understood as turning the boat over. Therefore, a good expression of will is good, but if it is wrong, it will make people feel embarrassed and even misunderstood. Say bon voyage to friends who travel by plane.