That is known to be impossible in our present world. The biggest eagle you will ever see in our present world would be one of the largest berkuts, such as Atlanta, seen here with Sam Barnes:
Barnes is a big man, around 6-7 or so, 300 lbs., and you can judge for yourself Atlanta's size from the picture. A Kirghis khan gave Atlanta to Barnes around 1970 because she had flounce, for which no cure existed in the CCCP, and would have died shortly. Barnes had meds for that back in England.
Atlanta at 24 lbs. or thereabouts is as big as berkuts ever get. The khan told Barnes that they only got one or two that size every fifty years or so and that a bird that size if healthy, would be worth more than a dozen of the most beautiful women in Kirghiz. They raise berkuts in Kirghiz partly to kill wolves and while, a wolf would be just a day at the office for Atlanta, it's a major undertaking for a more normal sized berkut at 14 - 17 lbs, and the wolf sometimes wins. Therefore it would be a huge advantage if they could breed them to an AVERAGE of 24 lbs., i.e. have a small one be 20 lbs. and a big one be 35 lbs., but it cannot be done. When they get past 25 lbs, they start to have insurmountable problems with takeoffs and landings.
That's in our gravity of course. The Argentinian teratorn did not have that problem.