In accordance with Section 21 C. 7. b. and c. of the PWA:
7. A pilot who has bypassed recall will be subject to the following:
a. he will …..
b. he may only return to duty:
1) in conjunction with a subsequent recall or new hire class, and
2) if he has notified the Company in writing of his desire to accept recall at least 30 days in advance of the class date on which he wishes to return.
Note one: The Company is not required to recall pilots in numbers greater than it deems necessary in a new-hire or recall class.
Note two: If there are more pilots who have bypassed recall that seek to return to duty than the Company has determined is required, such pilots will be returned to duty, in seniority order and prior to any new hire, in conjunction with Company scheduled new hire or recall classes,
and.........


I am not sure what contitutes a recall class or how it is determined, but it looks and sounds like it has NOTHING to do with hiring or new-hires.....

the recall class seems to always be referenced with an "or" in contract language.

I am unsure if flow-through pilots are not defined as new-hires though.