The rocker and his spouse, singer/songwriter Juliet Simms, were warned to keep their verbal spat to themselves and when the couple continued fighting, American Airlines staff separated the pair before an air marshall handcuffed Juliet, according to TMZ.

Police detained Simms upon arrival and she was later questioned and released.

Biersack and his wife have since told TMZ she got drunk on the flight after abstaining from alcohol for months.

The couple insists "everything's fine", and the Biersacks are co-operating with an FBI investigation.

The rocker married Simms in April (16).