What have and haven't we learned about extremism since 9/11?

Two decades on from the deadliest terror attack on US soil, the effects on air travel, surveillance and anti-Muslim sentiment continue to be felt.<br /><br />On the Sky News Daily podcast with Dermot Murnaghan, we are joined by Nick Aldworth, a former police counter-terror national coordinator, and Imam Usama Hasan, who talks about being a young Muslim man at the time and the importance of dialogue to combat extremism.<br /><br />Daily podcast team:<br />Senior podcast producer - Annie Joyce<br />Podcast producer - Nicola Eyers<br />Podcast researcher – Rosetta Fourlagawo<br />Podcast researcher – Faye de Silva <br />Interviews producer - Tatiana Alderson<br />Interviews producer – Alys Bowen<br />Archive - Simon Windsor<br />Archive - Rob Fellowes<br />Archive - Nelly Stefanova<br />Music - Steven Wheeler