Hello a_arie
No, not if you are travelling on a Supersaver tickets. A flight delay is not an event in which you can take the next train. The next train you could take if the previous train or bus service has been delayed. Therefore, we do not recommend usinf Supersaver tickets when you do arrive by air.
If you hold a Saver Day Pass, or a regular point-to-point ticket, these can be used on any connection, a possible flight delay is not relevant.
Best regards,
Roland