Star Alliance members TAP Portugal and Continental Airlines are to codeshare on flights to destinations in the USA, Central America, Europe and Africa from 11 October.
TAP will place its "TP" code on Continental flights between Newark and 20 US destinations plus Mexico City. The code will also apply to Continental's daily flights between Lisbon and its Newark hub.
Continental, meanwhile, is to add its "CO" code on TAP flights between Newark and Portugal - of which there are seven to 10 per week - and between Lisbon and the domestic destinations of Faro, Madeira and Oporto; cities in Spain, Germany, France and the UK; and the African destinations of Praia, Sal and Sao Tome.
Subject to government approval, Continental will also place its code on TAP flights to Morocco, Guinea-Bissau, Angola and Mozambique.