From the last MEC newsletter:
Based on the income reported to ALPA, it was discovered that dues were under-deducted by Delta payroll for approximately 800 pilots. The adjustments are primarily due to an error in DCO when an entire profit-sharing check is deposited into a pilot’s 401k. Dues have not been deducted in those situations, accounting for 40% of the total dues reconciliations. Approximately 173 pilots, 17% of the total pilots affected by the reconciliation, will receive a dues credit for dues improperly deducted by Delta.
Also:
If you find that your outstanding balance represents a financial burden, you may be eligible to set up a Payment Arrangement Plan. Per Article IX, Section 6 of ALPA’s Constitution and By-Laws, this Arrangement would allow you to remit your outstanding obligation in monthly installments.