Helicarrier (Ultimate Avengers)

The Helicarrier is a multi-functional flying aircraft carrier that serves as the capital ship and mobile headquarters of the Strategic Homeland Intervention Enforcement and Logistics Division or S.H.I.E.L.D. for short.

History
Its early history was largely unknown.

It might have possibly been built by Stark Enterprises out from a decommissioned US military aircraft carrier and sold it to S.H.I.E.L.D. for an expensive price.

The Helicarrier had landed into the Docks where Captain America witnessed the modern century.

It was later seen trying to fend off a Chitauri attack but was nearly badly damaged and crashed into the water. It survived the attack but it was damaged beyond repair and was decommissioned from service until got fully repaired with better weapon systems.