Drupal - How do you delete a content type's URL aliases in bulk?

I'd do it as an SQL query. Run as a SELECT first, to verify that all is well:

 SELECT alias FROM node n JOIN url_alias u ON CONCAT('node/', n.nid) =
 u.source WHERE n.type='my_type'

then edit it to make it a DELETE:

 DELETE u  FROM node n JOIN url_alias u ON CONCAT('node/', n.nid) =
 u.source WHERE n.type='my_type'

I'd go with Views Bulk Operations.

set the pathauto path for the content type to the default you want, but don't bulk update
create simple view for the content type you're interested in
add the field Bulk Opertations: Content
Under Bulk Operations Settings check Enable "Select all items on all pages"
select Update Node Alias
add filters as required

navigate to the view page, select all, uncheck any special cases, and give it a whirl

but maybe backup first

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