Need some help with dax to transform a table

Hi, new at PBI

I need help to tranform some attributes the folowing way:

In each line first airport can be an origin and/or a destination, depending on if there is >0 in take off (then it´s an origin) or a destination if landings is more or equal then one. The same with passengers.

Attributes: Date / Aiport A / Airport B / number of Landings / number of Take-off / Pax landed / Pax take-off

Observation example1: 01-01-2018 / Lisbon / London / 2 / 3 / 50 / 20 >>>>Lisbon is a destination, London an origin, pax landed 50 (two movements totalling 50 pax) + Lisbon is a ORIGIN, London an DESTINATION, pax took off =20 (three movements totalling 20 pax) 

This means I need to convert one line in two lines with these rules.

Observation example2: 01-02-2018 / Lisbon / London / 2 / 0 / 50 / 0 >>>>> Lisbon is a destination, London an origin, pax landed 50 (two movements totaling 50 pax)

This means no convertion here.        

Any advice?

Many thanks in advance.

Paulo