This would not be a Strike Assessment, MEC Assessment or LEC assessment. It would fall under a General Assessment of the membership.

Section 7 A.3. of the ALPA Constitution and Bylaws:

(3) General assessments may be levied by the Board of Directors or Executive Board on all Active members to cover extraordinary expenses provided such assessments are approved by a majority of the valid ballots returned by the Active members in good standing by ballot, conducted under Association Voting Procedures, and provided that such approval is obtained before such expenditures are made.