Aircrew Mobility in Europe: Why Home Base Is Becoming a Critical Compliance Question

Aircrew mobility is, by definition, international. A pilot may live in one country, be employed by an entity registered in another, start duty from a third country, and operate flights across several jurisdictions in the same working week. For airlines and aviation employers, that operational flexibility does not remove the obligation to determine which country's labour rules apply, where social security contributions are due, or whether a particular movement of crew amounts to a posting of workers.

A report published by the European Labour Authority in July 2026 shows how difficult that determination has become in practice. ELA estimates that around 394,500 people worked as aircrew in the EU in 2024, roughly 0.3 percent of total EU employment, yet pilots and cabin crew remain among the bloc's most internationally mobile workers. The regulatory challenge, the report concludes, is disproportionate to the size of the workforce.

The employment contract is only part of the picture

ELA's central finding is that authorities increasingly need to look past the paperwork and examine the operational reality behind an aircrew arrangement. Among the authorities the agency surveyed, 83 percent had encountered standard employment contracts, 45 percent had seen crew supplied through temporary work agencies, 43 percent had encountered self-employment arrangements, 40 percent had seen self-employment through intermediaries, and 18 percent had come across wet-lease structures.

None of these structures is automatically a problem. Difficulties arise when the contractual arrangement, the actual flying activity, and the declared employment or social security position do not line up. That gap is most likely to appear in wet leasing, temporary base changes, subcontracting chains, and multi-entity airline groups, where the entity that signs the employment contract may not tell the full story of where and how the crew member actually works.

Home base is a legal trigger, not just a scheduling term

For aircrew, the home base is the single most consequential concept in the compliance analysis. Under EU social security coordination rules, flight and cabin crew activity is generally treated as performed in the member state where the crew member's home base is located, meaning the location the operator assigns as the point where a crew member normally begins and ends a duty period.

That designation carries weight in three areas at once. It generally determines which country's social security system applies and which authority issues the PD A1 certificate. It is a key indicator for establishing an employee's habitual place of work under employment law. And it becomes central to posting analysis whenever a crew member is temporarily reassigned to a different operational base.

ELA is explicit that authorities may look beyond the location written into a contract and examine flight schedules, duty rosters, and the crew member's actual working pattern. Labelling a location as the home base does not settle the analysis if the factual pattern points elsewhere.

Not every border crossing is a posting

A second clarification in the report matters for day-to-day operations: crossing a border does not automatically create a posting of workers. A crew operating a flight from one member state to another and returning to its normal base will typically fall outside the Posted Workers Directive. The analysis changes considerably when there is a temporary assignment to a different operational base.

ELA illustrates this with a pilot temporarily moved from Lisbon to Paris for three months, a scenario the report treats as far more likely to trigger posting considerations, and with them host-country rules on remuneration, working time, and annual leave. Employers therefore need to separate normal international flight operations from a genuine, if temporary, change in where an employee performs their work. Member states do not apply this distinction uniformly, and the report identifies aircrew-specific posting derogations in several jurisdictions, so an approach that works in one country cannot be assumed to transfer to another.

Where enforcement is actually failing

ELA's survey of national authorities points to four recurring infringement categories: non-compliance with applicable social security rules, reported by 46 percent of authorities; non-compliance with national labour law in mobility situations, at 38 percent; missing PD A1 certificates, at 36 percent; and misclassification of employees, including suspected bogus self-employment, at 34 percent.

One further figure stands out. PD A1 certificates issued specifically for flight and cabin crew accounted for less than 4 percent of the estimated EU aircrew population in 2024. ELA does not treat this gap as proof of widespread non-compliance, but it does highlight how little centralised, reliable data currently exists on short-term aircrew mobility, which makes the certificate itself easy to treat as an afterthought rather than the output of a documented social security assessment made before the move.

Fragmented authorities, converging information

The report finds that, on average, four different national authorities may share some responsibility for labour mobility or social security enforcement in aviation within a single member state. Depending on the country, this can include labour inspectorates, social security institutions, tax authorities, civil aviation authorities, anti-fraud bodies, and in some cases immigration authorities.

The practical difficulty is that the authority holding the operational data is often not the one with legal competence to investigate the employment relationship. Civil aviation authorities may hold information on bases, flight operations, and licensing, while labour inspectorates or social security institutions have the power to open an employment investigation. ELA identifies stronger information exchange as a priority, including greater use of the Internal Market Information system, EESSI, and ELA-coordinated joint or concerted inspections. For employers, the takeaway is that compliance can no longer be built on the assumption that each authority only ever sees one slice of the arrangement.

For Romania specifically, ELA maps three separate authorities with a role in aircrew oversight: Inspecția Muncii, the Labour Inspectorate, responsible for labour law, working conditions, and undeclared work including cross-border situations, and empowered to carry out unannounced inspections as well as inspections triggered by referrals or complaints; Casa Națională de Pensii Publice, the National House of Public Pensions, which issues and can withdraw PD A1 certificates and principally relies on desk-based audits for social security coordination matters; and the Romanian Civil Aeronautical Authority, focused on aviation safety and aircrew certification. An airline or operator connected to Romania needs its employment, operational, and social security positions to tell a consistent story across all three.

What this means for aviation employers

Before changing a crew member's base, introducing an intermediary, adopting a leasing structure, or moving crew between jurisdictions, an employer should be able to answer a short set of questions: where does the employee genuinely start and end the majority of their duties; is the movement ordinary flight activity or a temporary assignment that could constitute a posting; which country's employment conditions apply; which social security legislation governs the position; whether a PD A1 is required and whether the underlying assessment is documented; and whether the contractual structure actually reflects how the work is performed.

The direction ELA's report sets out is toward what might be called mobility governance rather than mobility administration: making sure the employment contract, the operational model, the posting analysis, and the social security treatment are consistent with one another, assessed before a crew member moves rather than reconstructed after an authority asks for the file.

Nestlers Group works with aviation employers and other internationally mobile workforces operating in or connected to Romania to assess cross-border arrangements before they are put into practice. Our Immigration Advisory team reviews the underlying facts of a mobility case, including home base determinations and posting exposure, against the applicable Romanian and EU frameworks. Our Payroll and HR Compliance team handles the Romanian side of social security coordination, including the documentation that supports PD A1 applications and the statutory filings that follow a change in an employee's working base. Where an employer needs a compliant contracting or employment structure without establishing a Romanian entity, our Employer of Record service provides that legal employment relationship directly, in-house, without introducing an additional intermediary layer into the arrangement.

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*Sources: European Labour Authority, "Enforcement of labour mobility and social security coordination rules for aircrew members," Publications Office of the European Union, Luxembourg, 2026; European Transport Workers' Federation, commentary on the ELA aircrew enforcement report, 2026; Regulation (EC) No 883/2004 and Regulation (EC) No 987/2009 on the coordination of social security systems; Directive 96/71/EC as amended, the Posted Workers Directive; Casa Națională de Pensii Publice, guidance on A1 certificate issuance in Romania.*