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resources/js/Composables/useAlphabetAirlines.ts

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+import { computed, type Ref } from 'vue'
+import type { Flight } from '@/Types/types'
+
+export type CodeType = 'iata' | 'icao'
+
+const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('')
+const digits  = '0123456789'.split('')
+
+export function getAllLetters(showNumbers: boolean): string[] {
+    return showNumbers ? [...digits, ...letters] : letters
+}
+
+export function useAlphabetAirlines(
+    flights: Ref<Flight[]>,
+    codeType: Ref<CodeType>,
+    showNumbers: Ref<boolean>,
+) {
+    const allLetters = computed(() => getAllLetters(showNumbers.value))
+
+    const flightsByLetter = computed(() => {
+        const map: Record<string, Flight[]> = {}
+
+        for (const flight of flights.value) {
+            const raw = codeType.value === 'iata'
+                ? flight.airline?.IATA_code
+                : flight.airline?.ICAO_code
+
+            const code = raw?.trim().toUpperCase()
+            if (!code) continue
+
+            const key = code[0]
+            if (!allLetters.value.includes(key)) continue
+
+                ;(map[key] ??= []).push(flight)
+        }
+
+        return map
+    })
+
+    const visitedLetters = computed(() => new Set(Object.keys(flightsByLetter.value)))
+
+    return { flightsByLetter, visitedLetters, allLetters }
+}