Can a traveller only combine two prayers together at max?

If one is to undertake a long plane journey which will end up covering Zuhr, Asr, Maghrib and Isha time, can one wait until landing to pray? When combining prayer, can one only combine Zuhr and Asr as long as the time for either one has not passed, i.e. would they be considered missed if the time for Maghrib has been entered?