This is the only regulation that anyone needs to know - anything an individual carrier applies to its workforce over and above this is simply insurance.

The whole regulation for ANY airline employee covered under Part 121 rules:

TITLE 14--AERONAUTICSAND SPACE

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
(CONTINUED)

PART 121--OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL
OPERATIONS--Table of Contents

Subpart O--Crewmember Qualifications

Sec. 121.458 Misuse of alcohol.

(a) General. This section applies to employees who perform a
function listed in appendix J to this part for a certificate holder
(covered employees). For the purpose of this section, a person who meets
the definition of covered employee in appendix J is considered to be
performing the function for the certificate holder.
(b) Alcohol concentration. No covered employee shall report for duty
or remain on duty requiring the performance of safety-sensitive
functions while having an alcohol concentration of 0.04 or greater. No
certificate holder having actual knowledge that an employee has an
alcohol concentration of 0.04 or greater shall permit the employee to
perform or continue to perform safety-sensitive functions.
(c) On-duty use. No covered employee shall use alcohol while
performing safety-sensitive functions. No certificate holder having
actual knowledge that a covered employee is using alcohol while
performing safety-sensitive functions shall permit the employee to
perform or continue to perform safety-sensitive functions.

[[Page 452]]

(d) Pre-duty use. (1) No covered employee shall perform flight
crewmember or flight attendant duties within 8 hours after using
alcohol. No certificate holder having actual knowledge that such an
employee has used alcohol within 8 hours shall permit the employee to
perform or continue to perform the specified duties.
(2) No covered employee shall perform safety-sensitive duties other
than those specified in paragraph (d)(1) of this section within 4 hours
after using alcohol. No certificate holder having actual knowledge that
such an employee has used alcohol within 4 hours shall permit the
employee to perform or continue to perform safety-sensitive functions.
(e) Use following an accident. No covered employee who has actual
knowledge of an accident involving an aircraft for which he or she
performed a safety-sensitive function at or near the time of the
accident shall use alcohol for 8 hours following the accident, unless he
or she has been given a post-accident test under appendix J of this
part, or the employer has determined that the employee's performance
could not have contributed to the accident.
(f) Refusal to submit to a required alcohol test. No covered
employee shall refuse to submit to a post-accident, random, reasonable
suspicion, or follow-up alcohol test required under appendix J to this
part. No certificate holder shall permit an employee who refuses to
submit to such a test to perform or continue to perform safety-sensitive
functions.


And there you have it.