Property talk:P2986

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aircraft registration prefix
national prefix used in civil aircraft registration numbers

Data type	External identifier
Domain	According to this template: country (Q6256), geographic region (Q82794) According to statements in the property: country (Q6256) or geographic region (Q82794) When possible, data should only be stored as statements
Allowed values	[0-9A-Z][0-9A-Z-]*
Example	Austria (Q40) → OE French Guiana (Q3769) → F-O Kenya (Q114) → 5Y
Source	http://www.itu.int/online/mms/glad/cga_callsign.sh?lng=E
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P2986 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 17 Main statement 14 82.4% of uses Qualifier 3 17.6% of uses
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Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2986#Unique value, SPARQL (every item), SPARQL (by value)

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2986#Single value, SPARQL

Type “country (Q6256), geographic region (Q82794)”: item must contain property “instance of (P31)” with classes “country (Q6256), geographic region (Q82794)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P2986#Type Q6256, Q82794, hourly updated report, SPARQL

Format “[0-9A-Z][0-9A-Z-]*”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2986#Format, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2986#Entity types