A.Hardly had I arrived at the airport than the plane departed.
B.Scarcely had I arrived at the airport when the plane departed.✓ Correct
C.Hardly I had arrived at the airport when the plane departed.
D.Scarcely had I arrived at the airport then the plane departed.
Explanation
The standard constructions are: 'Hardly + had + subject + past participle + when + clause' and 'Scarcely + had + subject + past participle + when + clause'. Both 'hardly' and 'scarcely' are paired with 'when' (not 'than' or 'then'). The inversion (had + subject) is necessary. Therefore, 'Scarcely had I arrived at the airport when the plane departed' is the only grammatically correct sentence.
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