用了google這麼多年, 還不知道有這個功能. 剛才網上搜一下幾個航班, 都出現"Price are currently high for you trip"這個備注. 终于搜了另一班"Price are currently typical for your trip". 點開還看到這航程過去60天的價格圖表. 原來google根據過往的數據分析做出各類價格預估, 還有likely to increase, less than usual, unlikely to drop before you book等備注. 這些在訂機票時, 有實際參考作用.