No. b) is "Id rather you had gone by air. The construction with "I 'd rather" is either + bare infinitive (present or past) when there is only one subject/when the subject is the same EG: I'd rather do it myself I'd rather have have done it myself (I would have preferred to do it myself) or with what I call "modal preterite" when there are 2 subjects EG: I'd rather you did it yourself I'd rather you had done it yourself WHAT is the current name for a "modal preterite"?
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Are they equivalent to :
3) You would rather have arrived earlier.
4) I would rather you had arri