Eagles snatching the immortality elixir - Pjazi/Idun and Garuda/Amirtha

Pjazi and Idun

In Norse mythology,

Pjazi(eagle) kidnapped Loki when he tried to choo away the eagle and to release him from that Loki made a deal with Pjazi-eagle.

Deal:
Loki was to lure Idun-possessor of immortality secret - apples, out of Asgard.
Mission:
Loki lured her out by saying that he found similar apples  and wanted her to appraise or authenticate by comparing with those of hers - The apples of immortality.The secret of norse god's everlasting youth was Idun and her apples.
When she came out, Pjazi came again in eagle form and kidnapped Idun and as well as her apples.

Rescue:

When other gods realised Loki's involvement in disappearance of Idun, they forced him to retrieve her back. He took the form of a falcon and flew to Pjazi's place and turned Idun to a nut and brought her back to Asgard.
Aftermath:
When Pjazi came chasing back in eagle form the gods set fire on him and he fell dead.

Garuda and Amirtha
In Hindu mythology,
Garuda(eagle) had to release his mommy from the servitude from her sister and his cousin-brother serpents.

Deal:
In order to achieve that he had to steal immortality nectar Amritha from heaven.

Mission:

Garuda was able to retrieve Amirtha by signing couple of truces with Vishnu and Indra.  He offered himself as official vehicle for Lord Vishnu. The other one was with Indra.

Rescue:
He placed Amritha on the ground to the serpents thereby fulfilling his end of bargain to release his mommy, and advised them to take bath before consuming the immortality nectar. When they left Indra snatched the nectar back

Aftermath:

The serpents came back from their ablutions and saw the elixir gone but with small droplets of it on the grass. They tried to lick the droplets and thereby split their tongues in two. From then onwards, serpents have split tongues and shed their skin as a kind of immortality.

Moral of the story: Read the deal/contract twice or thrice before accepting. And watchout for the doublecrossers.