A galley structure installable in an aircraft cabin, comprising: one or more galley cart bays (114, 200), each galley cart bay comprising: a forward end accessible via the aircraft cabin; a rear wall opposite the forward end; two sidewalls (112, 116) extending between the forward end and the rear wall on either side of a cart space, the cart space capable of accommodating: an outer cart associated with an outer stowed position proximate to the forward end; and an inner cart associated with an inner stowed position between the outer cart and the rear wall; and an extraction and retention - E&R - system mounted to a first sidewall of the two sidewalls, the E&R system comprising: a housing mounted to the first sidewall, the housing comprising a retainer rod and an extractor rod set therewithin; a retainer arm coupled to the retainer rod, the retainer arm having a stowed position substantially vertical and parallel to the sidewall and a deployed position extending into the cart space, the retainer arm capable of securing the inner cart in the inner stowed position when in the deployed position; an extraction handle coupled to the retainer arm via the retainer rod and extending vertically from the housing along the first sidewall, the extraction handle including a retainer actuator rotatable by a user to transition the retainer arm between the stowed position and the deployed position; and an extractor arm coupled to the extraction handle via the extractor rod and disposed between the inner cart and the rear wall; the extraction handle capable of being displaced by the user parallel to the first sidewall to: extract the inner cart from the galley cart bay via the extractor arm; and return the inner cart to the inner stowed position via the retainer arm. a forward end accessible via the aircraft cabin; a rear wall opposite the forward end; two sidewalls (112, 116) extending between the forward end and the rear wall on either side of a cart space, the cart space capable of accommodating: an outer cart associated with an outer stowed position proximate to the forward end; and an inner cart associated with an inner stowed position between the outer cart and the rear wall; and an outer cart associated with an outer stowed position proximate to the forward end; and an inner cart associated with an inner stowed position between the outer cart and the rear wall; an extraction and retention - E&R - system mounted to a first sidewall of the two sidewalls, the E&R system comprising: a housing mounted to the first sidewall, the housing comprising a retainer rod and an extractor rod set therewithin; a retainer arm coupled to the retainer rod, the retainer arm having a stowed position substantially vertical and parallel to the sidewall and a deployed position extending into the cart space, the retainer arm capable of securing the inner cart in the inner stowed position when in the deployed position; an extraction handle coupled to the retainer arm via the retainer rod and extending vertically from the housing along the first sidewall, the extraction handle including a retainer actuator rotatable by a user to transition the retainer arm between the stowed position and the deployed position; and an extractor arm coupled to the extraction handle via the extractor rod and disposed between the inner cart and the rear wall; the extraction handle capable of being displaced by the user parallel to the first sidewall to: extract the inner cart from the galley cart bay via the extractor arm; and return the inner cart to the inner stowed position via the retainer arm. a housing mounted to the first sidewall, the housing comprising a retainer rod and an extractor rod set therewithin; a retainer arm coupled to the retainer rod, the retainer arm having a stowed position substantially vertical and parallel to the sidewall and a deployed position extending into the cart space, the retainer arm capable of securing the inner cart in the inner stowed position when in the deployed position; an extraction handle coupled to the retainer arm via the retainer rod and extending vertically from the housing along the first sidewall, the extraction handle including a retainer actuator rotatable by a user to transition the retainer arm between the stowed position and the deployed position; and an extractor arm coupled to the extraction handle via the extractor rod and disposed between the inner cart and the rear wall; the extraction handle capable of being displaced by the user parallel to the first sidewall to: extract the inner cart from the galley cart bay via the extractor arm; and return the inner cart to the inner stowed position via the retainer arm. extract the inner cart from the galley cart bay via the extractor arm; and return the inner cart to the inner stowed position via the retainer arm.