What is the grammatically correct phrase to use: "I am in the flight" or "I am on the flight"?

Both "I am in the flight" and "I am on the flight" can be considered grammatically correct, but the preferred usage is "I am on the flight" [1].

Here's an explanation of the usage:

1. "I am in the flight": This phrase suggests that you are physically inside the aircraft. It could imply that you are inside the cabin, seated in a specific class (e.g., business class or economy class) [1].

2. "I am on the flight": This phrase is more commonly used and implies that you are a passenger traveling by air. It emphasizes the idea of being aboard the aircraft rather than specifically being inside the cabin [1].

In general, "on the flight" is the more widely accepted and commonly used phrase when referring to being a passenger on an aircraft. However, it's important to note that both expressions can be used depending on the context and personal preference.

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1. Which is grammatically correct to say, 'I am in the flight ... - Quora