An aircraft interface apparatus for providing communication between an aircraft system and a passenger portable electronic device for use on an aircraft in-flight, the passenger portable electronic device being capable of providing content to the passenger in-flight, comprising:- a first communication means for providing communication with the aircraft system; and a second communication means for providing communication with the passenger portable electronic device, wherein the passenger portable electronic device uses a first data format and the aircraft system uses a second data format; wherein the aircraft system comprises at least one of an aircraft flight management system, an aircraft content distribution system, or an aircraft cabin management system; and wherein the apparatus further comprises:- an interface processing resource that is configured to receive data comprising an instruction in the first format from the passenger portable electronic device in-flight, to convert the instruction into a corresponding instruction in the second format that is actionable by the aircraft system and to output data comprising the corresponding instruction in the second format to the aircraft system in-flight, wherein the instruction in the first format is not actionable by the aircraft system prior to the conversion; and/or to receive data comprising an instruction in the second format from the aircraft system in-flight, to convert the instruction into a corresponding instruction in the first format that is actionable by the passenger portable electronic device, and, to output data comprising the corresponding instruction in the first format to the passenger portable electronic device in-flight, wherein the instruction in the second format is not actionable by the passenger portable electronic device prior to the conversion. a first communication means for providing communication with the aircraft system; and a second communication means for providing communication with the passenger portable electronic device, wherein the passenger portable electronic device uses a first data format and the aircraft system uses a second data format; wherein the aircraft system comprises at least one of an aircraft flight management system, an aircraft content distribution system, or an aircraft cabin management system; and wherein the apparatus further comprises:- an interface processing resource that is configured to receive data comprising an instruction in the first format from the passenger portable electronic device in-flight, to convert the instruction into a corresponding instruction in the second format that is actionable by the aircraft system and to output data comprising the corresponding instruction in the second format to the aircraft system in-flight, wherein the instruction in the first format is not actionable by the aircraft system prior to the conversion; and/or to receive data comprising an instruction in the second format from the aircraft system in-flight, to convert the instruction into a corresponding instruction in the first format that is actionable by the passenger portable electronic device, and, to output data comprising the corresponding instruction in the first format to the passenger portable electronic device in-flight, wherein the instruction in the second format is not actionable by the passenger portable electronic device prior to the conversion.