I am currently waiting for my green card in the USA. I was wondering if I could travel to Puerto Rico since it is a territory. Under my green card application I'm not allowed to leave the USA, if I do it is seen as abandoning my application. However if the flight is domestic I assume there would be no problem as there is no immigration.
Flights to Puerto Rico are considered domestic flights, and US Citizens do not need a passport to travel between the US and any US territories. However, foreign citizens do need a passport to travel between the two, (see answers.usa.gov) so I can't say for certain how a trip like that will affect your Green Card eligibility. Your best bet is to check with an immigration official.