CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed the ratings for British Airways Pass Through Trusts Series 2013-1 as follows: --Class A certificates at 'A'; --Class B certificates at 'BBB'. KEY RATING DRIVERS The A-tranche rating is primarily driven by a top-down analysis which evaluates the level of overcollateralization and likely recovery in a stress scenario. In the time since the previous rating action, values for the collateral aircraft have not deviated materially from Fitch's prior