I am not sure about airplane, but I have references for discovery gravitational laws in India. These are non-Indian references, so I suppose my point of view will be respected.

Given India school of mathematics already was advanced in trigonometry, calculus & astronomy according to following references:

+ Prior to discovery of infinite series and calculus by Newton and Leibniz, the Kerala School of Mathematics had already developed calculus and some historians suggest that this and advanced astronomical knowledge from Kerala went abroad via the Jesuits and provided the spark for its further development in Europe.

sources:

https://scholarworks.umt.edu/cgi/viewcontent.cgi?article=131...

https://press.princeton.edu/titles/9308.html

https://www.telegraphindia.com/india/restoring-indias-calcul...

+ It is very much possbile for Indians to have independently discover law of gravitation. Following paper establishes that Indians knew about Newton 'discovery' by 250 years.

source:

https://www.manchester.ac.uk/discover/news/indians-predated-...

+ Rig Veda is credited for contribution in value of Pi

source:

https://www.sanskritimagazine.com/vedic_science/value-pi-upt...

I cannot discount usage/knowledge of Airplane, battery, magnet, electricity, in India, unless it is firmly established they didnt had the technology. I choose to maintain status quo.