I noticed that early morning flights never show up. There are a lot of transpacific flights departing west coast aournd 1AM, none of them shows up no matter what date and time I select.

For example, 2-Jun SFO-ICN, there is a 1AM OZ213/UA4665, but the tool only shows UA893/OZ6615 at 1155AM. 2-Jun LAX-ICN, there are 1220AM OZ203/UA4663 and 1230AM KE12, but the tool only shows OZ201/UA4661 at 130PM. I am referring to non-stops only, disregarding connections.