Packet-boat

She proved to be a barco de aviso, or packet-boat, that was going with letters form Panama to Lima.

Source: wiktionary

The chief consul complains that, during , a certain period, every packet-boat that passed from Dover to Calais, brought over a cargo of libels.

Source: wiktionary

From this port the ten destined for Monterey sailed on the packet-boat "San Antonio," on the 2d of January of the year 1771, and after fifty-two days of rather trying voyage, on account of many bad storms, they arrived without incident at the port of San Diego on the 12th of March.

Source: wiktionary

The declaration contains ten counts, and in substance, they all and each of them charge, that Bromley, the defendant, was the captain of the packet-boat Empire, which regularly performed trips, at stated periods, between two places, from on to the other of which places the United States mail was regularly converyed, under the authority of the Post-Office Department, to wit, between Albion and Rochester;

Source: wiktionary