June 26 (Reuters) - Canada's WestJet Airlines has begun

cancelling flights after a union representing its maintenance

engineers rejected its new pay offer and served a second strike

notice, the carrier said on Wednesday.

WestJet said this action would lead to an estimated 25

flight cancellations over June 27-28 and impact over 3,300

guests.

(Reporting by Rishabh Jaiswal in Bengaluru; Editing by Janane

Venkatraman

)