A communication system onboard an aircraft, comprising: a first multi-frequency transceiver coupled to a first antenna; a second multi-frequency transceiver coupled to a second antenna; and at least one processor communicatively coupled to a memory, the first multi-frequency transceiver, and the second multi-frequency transceiver; wherein the at least one processor is configured to: establish a first air-to-ground data communication link with the first multi-frequency transceiver and a first ground station on a first frequency, wherein the first air-to-ground data communication link is a primary data communication link for the aircraft, wherein the first air-to-ground data communication link comprises both a first physical connection between the first multi-frequency transceiver and the first ground station and a first logical connection between the at least one processor and the first ground station; and before it is determined that a handoff is needed, establish a second air-to-ground data communication link with the second multi-frequency transceiver and a second ground station on a second frequency, wherein the second air-to-ground data communication link comprises both a second physical connection between the second multi-frequency transceiver and the second ground station and a second logical connection between the at least one processor and the second ground station, wherein the second frequency is different from the first frequency, the at least one processor configured to: transmit a contact message from the second multi-frequency transceiver to the second ground station on the second frequency; and receive a response with the second multi-frequency transceiver from the second ground station on the second frequency. a first multi-frequency transceiver coupled to a first antenna; a second multi-frequency transceiver coupled to a second antenna; and at least one processor communicatively coupled to a memory, the first multi-frequency transceiver, and the second multi-frequency transceiver; wherein the at least one processor is configured to: establish a first air-to-ground data communication link with the first multi-frequency transceiver and a first ground station on a first frequency, wherein the first air-to-ground data communication link is a primary data communication link for the aircraft, wherein the first air-to-ground data communication link comprises both a first physical connection between the first multi-frequency transceiver and the first ground station and a first logical connection between the at least one processor and the first ground station; and before it is determined that a handoff is needed, establish a second air-to-ground data communication link with the second multi-frequency transceiver and a second ground station on a second frequency, wherein the second air-to-ground data communication link comprises both a second physical connection between the second multi-frequency transceiver and the second ground station and a second logical connection between the at least one processor and the second ground station, wherein the second frequency is different from the first frequency, the at least one processor configured to: transmit a contact message from the second multi-frequency transceiver to the second ground station on the second frequency; and receive a response with the second multi-frequency transceiver from the second ground station on the second frequency. establish a first air-to-ground data communication link with the first multi-frequency transceiver and a first ground station on a first frequency, wherein the first air-to-ground data communication link is a primary data communication link for the aircraft, wherein the first air-to-ground data communication link comprises both a first physical connection between the first multi-frequency transceiver and the first ground station and a first logical connection between the at least one processor and the first ground station; and before it is determined that a handoff is needed, establish a second air-to-ground data communication link with the second multi-frequency transceiver and a second ground station on a second frequency, wherein the second air-to-ground data communication link comprises both a second physical connection between the second multi-frequency transceiver and the second ground station and a second logical connection between the at least one processor and the second ground station, wherein the second frequency is different from the first frequency, the at least one processor configured to: transmit a contact message from the second multi-frequency transceiver to the second ground station on the second frequency; and receive a response with the second multi-frequency transceiver from the second ground station on the second frequency. transmit a contact message from the second multi-frequency transceiver to the second ground station on the second frequency; and receive a response with the second multi-frequency transceiver from the second ground station on the second frequency.