Home > News > Reserve Review: Reserve Preferencing & Clean-up vs. Ready Reserve Assignments

Reserve Review: Reserve Preferencing & Clean-up vs. Ready Reserve Assignments

Date: April 14, 2020


MEC Reserve Committee

We will see a larger population of Flight Attendants on Reserve status during the May schedule month. For some, it may be the first time on Reserve in a long time; perhaps even the first time since implementation of the scheduling provisions of the JCBA. We will be providing a review of various aspects of the Reserve system along with direction on where to find more information regarding these and other topics in the upcoming editions of E-lines. 

The most comprehensive source of information is the Reserve Survival Guide found on the MEC website, which can be downloaded to your personal device.

It is important we start by making the distinction between the two (2) different Reserve assignment processes and when they occur: 

1. Reserve Preferencing and Clean-up assignments are made before 1930 HDT the evening prior to a day of availability. 

2.  Ready Reserve assignments are made after 1930 HDT the evening prior to a day of availability and continue throughout the next day for same-day assignments. 

Flight Attendants have the ability to input preferences for each process, however, each of these two (2) types of preferencing is completely separate and distinct from the other.The preferences that are considered depend on when the Reserve assignment is made.


The Reserve Preferencing assignment process begins each evening at approximately1700 HDT for open positions that check-in the following day between 0500 and 2359 HDT. (Section 8.D.2.)  During this process, preferences that are submitted using the Reserve Preferencing system are considered. This system may be accessed under the Reserve tab in CCS (see image above) or directly at pref.ual.com.



This preferencing system is easily distinguished by the fact that the Flight Attendant user is redirected from CCS to a page that opens in a separate tab or browser window.

The deadline to submit Reserve Preferencing requests for the following day is 1600 HDT. More information on inputting Reserve Preferencing requests may be found in the Appendix of the Reserve Survival Guide or by watching the video tutorials on the MEC website.


NOTE: During the Clean-up process (which occurs after the Reserve preferencing system runs, but prior to 1930 HDT) pairings that became open while the system was running are assigned to remaining Reserves in strict Days Available/TMAC order. No preferences of any kind are considered during Clean-up.

Ready Reserve preferences are considered when assignments are made to Flight Attendants who have been assigned to Ready Reserve status for the day during the 1930 HDT assignment process. Ready Reserve Preferencing may also be accessed under the Reserve tab in CCS . (See Image above)


The Ready Reserve Preferencing screen is distinguished by the fact that it will open within CCS.

On this screen, Ready Reserve preferences for the following options only may be indicated:

  1. Maximum Flying (RTF: “Request to Fly”)
  2. Minimum Flying (RMF: “Request Minimum Flying”)
  3. Standby Reserve (RSB: “Request Standby”), or 
  4. No Preference (RNP: “Request No Preference”)

There is no deadline to submit Ready Reserve preferences, and they may be changed at any time. More information on Ready Reserve Preferencing may be found starting on page 36 of the Reserve Survival Guide.



Reserve Preferencing and


Ready Reserve

When are assignments processed?

Before1930 HDT

For assignments that check in the next day.

(Process begins at approximately 1700 HDT.)

After1930 HDT

For assignments that check in the next day and continuing throughout the day-of-check in.

15 – 3-hour notice prior to check-in.

Who makes the assignments?

The automated Reserve Preferencing system, followed by a manual “Clean-up” process for remaining open assignments

Crew Schedulers make manual Reserve assignments.

Which Reserves are assigned during the process?

All Reserves who are available for the next day participate

Reserves who did not receive an assignment during the Preferencing and Clean-up process and who were not “RLSD” for the next day

How do I preference?

Using theReserve Preferencing Portal

pref.ual.com; or

CCS>Reserve>Reserve Preferencing

NOTE: No preferences are considered during the Clean-up Process.


CCS>Reserve>Ready Reserve Preferencing

When do I preference?

By 1600 HDT on the day prior to check-in.

Re-opens at 1930 HDT for next-day’s process.

Any time prior to assignment.

(may be changed continuously)

How are Reserves ordered?


NOTE: The order shown in CCS on the Reserve Availability screen automatically adjusts at 1930 HDT to reflect the appropriate ordering considerations for each process.

Days Available

Time Accrued (TMAC)

First-in First-out (FIFO)


Days Available

Ready Reserve Preference based on type of assignment:











Time Accrued (TMAC)

First-in First-out (FIFO)


Where can I find more information?

Reserve Survival Guide

pg. 29-32; 94-104

MEC Website

Written Training Materials

Online Video Training Course

Reserve Survival Guide

pg. 36-42


The most important distinction is that the two types of preferencing are completely separate from one another

Reserve Preferencing requests are only considered when the system runs at 1700 HDT each evening.

Ready Reserve preferences are only considered after 1930 HDT for those who have been assigned to Ready Reserve status for the assignment day when assignments are being made to open pairings or Standby positions.

If you have additional questions, please contact your Local Council Reserve Committee.

Share this page:

More News