Editor’s Note: CrewSignal uses public records to compare how unions structure, negotiate, communicate, and protect Flight Attendants during mergers and representation proceedings. It may raise questions supported by the record; it will not fabricate facts or state conclusions the evidence cannot establish. This report is informational and does not constitute legal, investment, or merger advice.
Status Summary
Allegiant’s Form 10-Q filed on August 10 materially clarified the operational and labor sequence for the Allegiant / Sun Country integration. The filing stated that integration was underway, but that Allegiant Air and Sun Country continued to operate as separate airlines under FAA rules. Allegiant reported that it had applied for a single operating certificate, expected in 2028, and that its ability to combine operations would remain limited until the certificate was obtained and joint collective bargaining agreements were in place for the affected unionized work groups.
The filing also stated that Allegiant may be required to negotiate JCBAs to fully integrate the respective pre-merger represented crafts or classes and that, where necessary, those negotiations would likely begin after the NMB certified a single post-merger representative. For Flight Attendants, that statement places the unresolved relationship between TWU Local 577 and IBT Local 120 directly in the integration sequence without identifying who will file, whether the unions will proceed jointly, how members will participate, or what representation evidence will be submitted.
CrewSignal identified no public TWU–IBT Flight Attendant transition agreement, joint negotiating structure, seniority-integration protocol, NMB application, or NMB single-transportation-system determination during the week. The NMB activity report for August 10–14 listed no representation action involving Allegiant, Sun Country, or their Flight Attendants.
Integration Dashboard
- Allegiant reported that the integration of Sun Country was underway while both companies continued to operate as separate airlines under FAA rules.
- The Form 10-Q continued to identify Allegiant Air and Sun Country as separate reporting units for accounting purposes.
- Allegiant had applied for a single operating certificate and stated that it expected to obtain the certificate in 2028.
- The company stated that its ability to combine operations would remain limited until it obtained the single operating certificate and JCBAs were in place for the affected unionized work groups.
- Allegiant said JCBAs may be required to fully integrate represented groups and, where necessary, would likely be negotiated after the NMB certified a single post-merger representative.
- Allegiant Flight Attendants remained represented by TWU Local 577, while Sun Country Flight Attendants remained represented by IBT Local 120.
- No public joint TWU–IBT Flight Attendant transition protocol, bargaining committee, seniority process, or interim representation arrangement was identified.
- The formal NMB question often described as a single-carrier determination is whether a single transportation system exists for the Flight Attendants craft or class.
- Carrier notice, common ownership, commercial integration, management support, or an FAA transition plan does not itself initiate the representation case or automatically establish a single transportation system.
- Any organization or individual may file an application seeking the determination, and the NMB then conducts a fact-specific investigation.
- Relevant factors include combined routes or schedules, common branding, integrated scheduling or dispatching, centralized labor and personnel operations, common management, a combined workforce, and common ownership.
- After a single-transportation-system finding, every applicant must establish support from at least 50 percent of the combined Flight Attendant craft or class.
- Incumbent representatives may rely on certifications, current collective bargaining agreements, seniority lists, dues-checkoff records, or other current-representation evidence.
- A filer representing none of the covered Flight Attendants must establish its showing with valid authorization cards.
- Applicants and intervenors may submit or supplement the combined-craft showing within 30 calendar days after the determination, and existing certifications remain effective until the NMB issues a new certification or dismissal.
CrewSignal Watch Points
- Will TWU Local 577 and IBT Local 120 establish and publish a member-accountable Flight Attendant transition protocol before company integration advances further?
- Watch for disclosure of who will file or join an NMB application, whether the unions will proceed jointly or competitively, and what showing each organization will rely upon.
- Watch for authorization-card activity while distinguishing a nonincumbent card campaign from the current-representation evidence available to incumbent unions.
- Watch for interim protections covering scope, mixed crews, aircraft transfers, scheduling, training, bases, benefits, furloughs, and movement of work before a combined certification and JCBA are in place.
- Does the company’s stated sequencing create a risk that operational integration will outpace transparent union planning for representation, seniority, and bargaining?
- Which union’s merger policy, governance structure, and record offers Flight Attendants the clearer member voice and stronger enforceable protections during this transition?
- Watch present integration facts relevant to a future NMB inquiry, including centralized Flight Attendant labor administration, common crew scheduling, standardized uniforms, combined training, mixed crews, base integration, and progress toward the single operating certificate.
Notable Public References
- Allegiant Form 10-Q describing separate operations, single-operating-certificate timing, and potential JCBA sequencing (filed Aug. 10, 2026) — View →
- NMB weekly activity report for Aug. 10–14, 2026 — View →
- NMB Representation Manual merger and showing-of-interest procedures — View →
- TWU Local 577 Allegiant Flight Attendant contract-ratification announcement (Apr. 15, 2024) — View →
- IBT Local 120 Sun Country Flight Attendant contract-ratification announcement (Mar. 4, 2025) — View →