The number of flying A350 XWB test aircraft doubled from two to four on 26 February 2014 with the simultaneous maiden flights of MSN2 and MSN4 - both of which were performed from Toulouse, France. MSN2 is the first developmental aircraft to feature a full passenger cabin, allowing Airbus to begin validating all related systems; while MSN4 will be used for multiple test activities - including low-weight flight envelope certification and external noise measurements among others.

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