Timezone in Calendar

I am planning an international flight. I have the flight details, with local departure times and arrival time at destination. I have entered these into my Calendar.

Due to the differences in timezone this appears as an 8 hour trip, when in reality is is 19.

Is there a way to enter timezone so the duration shows correctly and so when I adjust my timezone on arrival, it will show the correct local time.

I have turned on timezone support, but there seems to be no way to have a different timezone for start/end times.