やはりLCCにはあらず

と書いても問題ないでしょう。
General Conditions Of Carriage
These Conditions of Carriage (hereinafter – Conditions) are the only general conditions, in addition to other special conditions, that are binding upon Air Baltic Corporation AS, and are Anchorconsidered to be an integral part of the Air Transport Agreement.

Last updated on 20.03.2019

ARTICLE 13 - FLIGHT CHANGES

13.3. We take all possible measures to avoid changes in flight times, flight delays or cancellations. Therefore, in cases when We are taking the necessary actions, We, among other things, are entitled to complete the flight to Your chosen destination with another aircraft and/or to entrust the operation of the flight to another Carrier if thereby, in Our opinion, it will be possible to avoid changes in flight times and flight delays or cancellations, and/or to decrease the flight delay time.

純粋なLCCは他社で運ぶことはしません。このは、他社を利用してでも運ぶと謳っています。