[FIXED] wrong logic in flight scheduling

[airlinemanage]

CA115 is a flight from pek to hkg at 15:30, CA107 is a flight from pek to hkg at 18:30, both flights take around 3 hours to fly, and is handled by the same aircraft. Thus, you can only see either one in each day. HOWEVER, this time I see both at the same time (situation captured in the attached document). This means that an aircraft has just landed in HKG and then it starts a flight from PEK to HKG.