There is close to 0 chance of PDX getting 777/747 flights in the next decade, much less any of the newer planes (A380 or 787). The glory days for airplane watching at PDX ended when DL shut down it's trans-Pacific hub and later their 767 maintenance base. DL used to run 12 widebodies per hour through PDX at peak times. Things have changed a bit since then, and while PDX is a fine airport, the airlines prefer SEA for international service. An interesting commentary on how the airline industry (and politics) really works.