So what I’m hearing is, concerned citizens should go to airports and keep a look out for groups of three people where two look like cops and one looks scared, then draw attention to them. If ICE lets them go and it’s a departing flight, inform other passengers and post to local news and social media platforms in the arrival city so people can accompany them to the gate and others can meet them there and escort them through baggage claims and to their destination (or, you know, advise them not to fly).

Edit: given that this was a connecting flight, his fellow passengers could accompany him to his next gate and inform his future co-passengers, and that arrival city (if still in the US or a country likely to extradite to ICE), ad infinitum, if needed