Palma Airport offers an excellent variety of aircraft, used to live there!
German flights definitely are the most active, as stated before daily shuttle flights for the tourists and increasingly ex-pats operate. Scandanavian, UK and Dutch flights are also busy but more on certain days. PMI is also very much a 24 hour operation.
The terminal has no views except to departing passengers ater immigration, and then limited due to the very badly designed new terminal !
There are also now a lot of eastern european charter flights, so lots of variety on aircraft types.
The best vieing spot for viewing is from C'an Pastilla, just before entering the slip road for the airport from the motorway, there is an exit for the town. you will be right underneath the flight path...Literally!
There is also a road to the side of the main runway, but this looks like a finca and apparently you will be moved away, PMI is also a military base!