# IAS

CEFR C1 · Noun

Source: https://englishreference.com/word/ias
Updated: 2026-05-19

## Definition

Stands for International Air Services. A set of rules and agreements that allow planes from different countries to fly through each other's airspace. It helps pilots and airlines plan their routes safely.

For teachers: Abbreviation for International Air Services. A set of international agreements and protocols that govern the operation of aircraft in foreign airspace, including flight planning, communication, and navigation standards.

## Examples

- Pilots must follow IAS rules when flying over international borders.
- The airline's flight planning department ensures all routes comply with IAS regulations to avoid delays at the border.
- Effective implementation of IAS requires seamless coordination between national aviation authorities to maintain the safety and efficiency of global air traffic.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.