@LetsJustGo- from the Malpensa website-
In the event of cancellation of airport service trains, buses without intermediate stops will be set up between: Milan Cadorna and Malpensa Airport for the Malpensa Express. From Milan Cadorna the buses will leave from via Paleocapa 1.
Stabio and Malpensa Airport for the S50 Malpensa Airport – Stabio airport connection.
The following trains are guaranteed (also from their website)-from the Airport to Stabio at 0722, 0822, 1922 and 2022.
To the airport from Stabio at 0747, 0847, 1947 and 2047
from the Airport to Milan C at 0607, 0637, 0707, 0737, 1807, 1837, 1907 and 1937
From Milan C to the Airport at 0625, 0655, 0725, 0755, 1825, 1855, 1925 and 1955
https://www.malpensaexpress.it/fileadmin/contenuti/TRENORD/3-News/Trenord_Informa/Avvisi/Elenco_Treni_Garantiti_Sciopero_24h.pdf