As fev says, "within" pretty clearly means that there is some range of time in which you must fill out the form. The potential ambiguity is because in "within 10 days before the flight", the following noun phrase "10 days before the flight" has a form that would generally cause it to be interpreted as a point in time rather than a range.
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(something) is (amount) within [of (something else)]. My office is within 2 miles of the bus station. The second train departs within 5 minutes of the first train's arrival. It is common to drop the last part. In that case, you would normally understand it to mean "now" for time, "here" for space, and so on: My office is within 2 miles.
Here is the definition of the word within from Oxford Dictionary: inside (something) So does that mean the two words have no difference, and can be used exchangingly? Is there any connotation tha...