The Mew2KenShayaMBR Combo
Non-uair tippers can combo too, and as can be expected at higher percents. But it's harder to hit with, the trajectory the opponent goes in isn't always favourable, etc etc. Anyway, percents are for tippers unless stated otherwise, and for fresh moves.
Up Air -> Up smash (30%)
The timing/placement for the combo gets more complicated the higher the percent. Tipping the uair is easier than not on grounded opponents. While 30% with Mario is about 9/10 successful, 31% was ughh, and you can only imagine how it gets more and more difficult from there. Opponent's DI comes into play as well.
Mario - 33%
Bowser - 48%
Jigglypuff - 22%
--- Aerial move follow ups ---
You will most likely find that hitting with untippered uair's are A LOT better after certain percents. I havn't tested them extensively, but untippered uairs are 'made' for using a fair or something afterwards. These combos for tip uairs can have another 20-30% added to them using a normal uair. [e.g. normal uair to tip bair at 76% did 24% damage and was a natural combo].