If we wish to say:
I am going to .. and then list a series of places, is it necessary or unnecessary to repeat the a for each item in the series.
I am going to the airport, the hotel, and then the office.
Voy al aeropuerto, al hotel y, entonces, a la oficina.
Voy al aeropuerto, el hotel y, entonces, la oficina.
I'm voting for repeating the a for each item in the series, but since someone asked me whether it was necessary, I thought I might inquire of native speakers or better grammarians.