First of all, you can have an idea of the traffic at Linate at this link: http://www.milanolinate.eu/en
(the airport website, English version).
As you may notice, the traffic is mainly made up of Alitalia's A320 family aircraft, Alitalia's E-jets and a few flights of other airlines like Meridiana, AF
, KLM, Aerlingus, BA
and a few others.
As far as Alitalia aircraft are concerned, you may have a good chance of seeing EI
(Alitalia E190 Skyteam colors): it seems that it shows up frequently here, definitely more than the other Alitalia special EI
-IXI (A321 retro colors).
Of course there should be also some biz-jet movements
If compared to other airports located near a big city, Linate has definitely a very bad public transportation network: as far as I am concerned, I always get there by car or, in good season, by bike.
I used public transportation probably 1 or 2 times, always in the morning.
It is, in fact, the morning the period I would suggest you, since it should be the one with more variety of traffic; more over, I prefer more the morning spots.
Your hotel seems to be close to Corso Lodi, where you can take metro M3
(yellow line): a great advantage indeed.
I don't suggest you to take the bus from San Babila square to the airport, since you will get off at the terminal only... and the spots are very far from there.
What I feel like to suggest you is to take metro M3
to San Donato station (Southbound, the station is the one at end of the line).
Once got off the metro you will have to go out by the turnstile row right in front of you: you will see a bar and a news-stand. Turn right or left, at your choice, but make sure to find the stairs to the "Lato Paullese" exit, where your bus will leave (even if I cannot remember the exact pole).
The fare should be the urban one + 1 zone (something like 2€ for a single ride).
This is the website of the main Milan Area transportation service: http://www.atm-mi.it/it/Pagine/default.aspx,
there is also the English version.
you can find all the data about lines and time schedules.
The line I suggest you is 901, which takes you to Canzo, ideal area for morning spotting.
You have to get off in the small town of Canzo, right near the morning spots.
(As you can see, they are not so frequent... )
Then, for the journey back I suggest you to go to another bus stop: (45.4270699927955, 9.28869366645813)
and take the first one that takes you to the metro (you may ask to the driver, but generally most of buses that passes there stop at metro too)
I cannot tell you about going to the west side of the perimeter since I don't know about it... I may misguide you, but the situation should be even worse!
If you are planning to spend some more time for spotting, why don't consider also Malpensa?
Hope it helps