Probably because both are pretty cutting-edge?
What did Boeing contribute to American's 'sixth generation' technology?
Well probably becasue both are designed by indians and built by weed-smokers?
The US technology developement nowadays are pretty much screwed, have you ever heard of any cutting-edge defence tech that the US developed are not haunted with problems and delays?
Be it hypersonic vehicles, air-air missiles, railguns, robots and drones, and EMALs.
Guess why? in the past the US defence industry are dominated by Chinese and East European engineers and now it is flood with indians, and thats why.