Software techniques are employed to mitigate soft errors. A retainer can be moved to a full locking position in the housing and contacts the terminal fittings to hold them at their proper insertion positions, thereby preventing them from shaking. A combined routing metric is calculated using a scaling factor for discouraging usage of restricted communication links and encouraging usage of non-restricted communication links. The processing unit encrypts the first data element using the private cryptographic key and the second data element, modifies the second data element, combines the encrypted first data element and the second data element to generate a single-use financial account identifier, and displays the single-use financial account identifier. The method involves ion plasma cleaning the surface of the airfoil before depositing the metallic coating and then the ceramic coating. The circulating gas removes heat directly from the electronic display surfaces.