My friend is returning to South America after having overstayed his US visa (and outlasted the validity of his Peruvian passport, now expired). When he is departing from MIA what procedures will he go through and how many hours should he allow for them.

Also, it is correct, right, that given he has only the expired passport that he may not get to MIA by air (i.e.,fly a domestic segment to his connection) even with a ticket on his "way out".

Obviously not much experience myself with the situation so I don't know what to tell him.