The "ALEPPO" seems to have been going to either New York or Boston from Liverpool in 1868. If you have access to Ancestry's Passenger Lists, go to SEARCH. Click Immigration & Travel - then on the right of the page that comes up click New York Passenger Lists 1820 - 1957.
On the page that comes up, type in ....
Arrival: 1868 USA
Departure: 1868 UK
Where it says Keyword, type in that box, Ship: ALEPPO
Lists of information comes up. On the first two pages, you should see the ship was carrying Dutch Immigrants to America. There is no VIEW IMAGE for this, so you can't get into the original ships passenger lists.
But on the following pages you can get in by clicking
VIEW IMAGE on any passenger.
Some voyage dates I noted down, all by the ALEPPO.
Arriving New York from Liverpool...
Arrived 4 Jun 1868 Aleppo New York
Arrived 24 Aug 1868 Aleppo New York
Arrived 9 Sep 1868 Aleppo New York
Arriving Boston from Liverpool...
Arrived 22 Jan 1868 Aleppo Boston
Arrived 5 Mar 1868 Aleppo Boston
Arrived 13 Jul 1868 Aleppo Boston
Arrived 5 Oct 1868 Aleppo Boston
Arrived 18 Nov 1868 Aleppo Boston
There are probably more voyages by the ALEPPO in 1868
but this is as far as I searched.