Praying jammu and kasr,?

assalamu 'alaykum,brothers & sisters,i have a doubt regarding praying salah,making it jammu & kasr.if v happened to go on travel and reach home late,after Maghrib is over and time for 'Isha,how do we pray?do we pray 'Isha as 2 rakah or 4?i know that during time of travel,we pray it as 2 rakah,but isn't it the same after travel,when we reach home?pls answer..