ANSWER:

What you did was wrong.

You should have offered 4 rakah thuhur and 4 rakah asr as you had reached your hometown and can’t shorten your prayers anymore.

Repeat your thuhur now. 

Upon travelling on the plane to hometown it was zuhr time but due to hardship in standing & pray & facing the qiblah,I delayed zuhr till asr as I knew I would reach home when there will still be time for asr.I combined zuhr and asr prayer.Praying zuhr as two rakah and praying 4 rakahs for asr as I reached home.Did I do wrong delaying the zuhr & praying 2 rakah for zuhr instead of 4 with asr prayer