A system for managing thermal transfer in at least one of an aircraft or a gas turbine engine, the system comprising: a first engine system utilizing an oil for heat transfer; and a fuel system, the fuel system comprising: a deoxygenation unit for deoxygenating a fuel in the fuel system; a fuel-oil heat exchanger located downstream of the deoxygenation unit, the fuel-oil heat exchanger in thermal communication with the oil in the first engine system and the fuel in the fuel system for transferring heat from the oil in the first engine system to the fuel in the fuel system; a supplemental fuel pump located downstream of the fuel-oil heat exchanger configured to increase the pressure of the fuel; characterized in that the system for managing thermal transfer further comprises: a fuel metering unit comprising a fuel bypass valve, a fuel metering valve, and a booster pump; a first bypass conduit; and a second bypass conduit; wherein the fuel bypass valve is positioned upstream of the deoxygenation unit; the fuel metering unit is located downstream of the supplemental fuel pump and is configured to split the heated and deoxygenated fuel for delivery to one of a combustor of the gas turbine engine and the fuel bypass valve; the fuel bypass valve is configured to send a first portion of the heated and deoxygenated fuel to the deoxygenation unit through the first bypass conduit and a second portion of the heated and deoxygenated fuel to the booster pump through the second bypass conduit. a deoxygenation unit for deoxygenating a fuel in the fuel system; a fuel-oil heat exchanger located downstream of the deoxygenation unit, the fuel-oil heat exchanger in thermal communication with the oil in the first engine system and the fuel in the fuel system for transferring heat from the oil in the first engine system to the fuel in the fuel system; a supplemental fuel pump located downstream of the fuel-oil heat exchanger configured to increase the pressure of the fuel; characterized in that the system for managing thermal transfer further comprises: a fuel metering unit comprising a fuel bypass valve, a fuel metering valve, and a booster pump; a first bypass conduit; and a second bypass conduit; wherein the fuel bypass valve is positioned upstream of the deoxygenation unit; the fuel metering unit is located downstream of the supplemental fuel pump and is configured to split the heated and deoxygenated fuel for delivery to one of a combustor of the gas turbine engine and the fuel bypass valve; the fuel bypass valve is configured to send a first portion of the heated and deoxygenated fuel to the deoxygenation unit through the first bypass conduit and a second portion of the heated and deoxygenated fuel to the booster pump through the second bypass conduit. a fuel metering unit comprising a fuel bypass valve, a fuel metering valve, and a booster pump; a first bypass conduit; and a second bypass conduit; wherein the fuel bypass valve is positioned upstream of the deoxygenation unit; the fuel metering unit is located downstream of the supplemental fuel pump and is configured to split the heated and deoxygenated fuel for delivery to one of a combustor of the gas turbine engine and the fuel bypass valve; the fuel bypass valve is configured to send a first portion of the heated and deoxygenated fuel to the deoxygenation unit through the first bypass conduit and a second portion of the heated and deoxygenated fuel to the booster pump through the second bypass conduit.