[Grammar] Our estimated arrival is 4 P.M.

[kadioguy]

(In a Toeic listening test)

Our estimated arrival is 4 P.M.

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Why isn't there an 'at' before '4 P.M.'? (I.e., Our estimated arrival is at 4 P.M.)

I assume that the following is all correct and means the same. Is that right?

a. Our estimated arrival is 4 P.M.

b. Our estimated arrival is at 4 P.M.

c. Our estimated arrival time is 4 P.M.

d. Our estimated arrival time is at 4 P.M.
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(Source)
https://i.imgur.com/9W7phnY.jpg

 

[GoesStation]

Don't add the preposition in C and D. The time isn't at a time, it is one.

A and B are fine.

 

[jutfrank]

One way to make sense of the lack of preposition in the original is to interpret arrival to mean 'time of arrival'. Then you can understand it in GoesStation's terms: a time is not at a time, it is one.

(I hope that makes sense!)