Checks the best values found for the current previous node being looked at
against the best values found among all previous nodes for the current
node whose last aircraft is being scheduled.
Updates the best recorded values for the aircraft currently being scheduled
based on the best values recorded for the previous node currently under
consideration.
Updates the best sequence found so far for this node and its associated values
if the given sequence is valid and incurs less delay than the one currently
saved, or if there is no currently saved best sequence for this node.
Solves for the best schedule where the current aircraft's optimal
spot release time is the most recently calculated, when following
the previous node currently being considered, when basing this
optimal schedule on the one given.