Question

what are the changes in the bird bodies that adopt them to aerial habit

Answer 1

The changes that took place in birds are that the fore limbs of animals were modified into wings while the bones got hollow and air sacs developed.
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Answer 2

Feathered, hollow-boned birds have long feathers on its two sides thathelp them for flight, although they have a boat shaped appearance.

These flight feathers are thus specifically shaped feathers which provide lift and reduce drag.

The other changes that these birds have are the finger bones that create a strong anchor for flight feathers, and longer, strong front limbs.