I will at the airport.
I will be a the airport.
which statement is correct for simple future. Please explain the fact behind it.
Neither is correct.
Correct = I will be at the airport.
Study this webpage carefully:
http://www.englishclub.com/grammar/verb-tenses.htm
The correct statement for simple future is "I will be at the airport."
In the simple future tense, we use the modal verb "will" before the main verb to talk about actions that will happen in the future. In this case, the main verb is "be," indicating the location as "at the airport."
The reason why "will" is used in this sentence is because it expresses a decision made at the moment of speaking or a spontaneous action in the future. It indicates that the speaker has made a choice to be at the airport in the future.