"what airline did you fly on?" vs "which airline did you fly on?"

Question

"what airline did you fly on?" vs "which airline did you fly on?"

Both phrases are correct, but they are used in slightly different contexts. 'What airline did you fly on?' is more informal and commonly used in everyday conversations. 'Which airline did you fly on?' is more formal and is often used in written or professional contexts.

Last Updated: March 31, 2024

This phrase is suitable for casual conversations when asking someone about the airline they used for a flight.

Examples:

What airline did you fly on for your vacation?
What airline did you fly on last time?
What airline did you fly on for your business trip?

Alternatives:

Which airline did you fly with?
Which airline did you use?
Which airline did you take?
Which airline did you travel with?
Which airline did you choose?

This phrase is appropriate when asking about the specific airline someone used for a flight in a more formal setting.

Examples:

Which airline did you fly on for the business trip?
Which airline did you fly on for the conference?
Which airline did you fly on for the international flight?

Alternatives:

What airline did you fly with?
What airline did you use?
What airline did you take?
What airline did you travel with?
What airline did you choose?

Answer 1

what airline did you fly on?

This phrase is correct and commonly used in informal conversations.

Answer 2

which airline did you fly on?

This phrase is correct and more formal, suitable for written or professional contexts.

"what airline did you fly on?" vs "which airline did you fly on?"

what airline did you fly on?

which airline did you fly on?

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