Earlier quoted context omitted.
So crows could build a jumbo jet, they're just lazy? It's pretty obvious that animals lack any type of intelligence even close to human ability. It's not even in the same ballpark.
Crows absolutely could build a jumbo jet, they just have no need to because they can already fly.
More realistically: have they mastered fire? There are caloric efficiency benefits to eating warm/cooked food[0]. Have they mastered writing? There's compound interest in terms of civilization development sitting right there, in the ability to put thoughts into a form that outlives individuals without degrading.
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[0] - At least for humans; IANABiologist, but I'd guess this would be true for other animals too, including birds, and at the very least it would expand the range of foods they can consume.