The timing is a bit more strict on that though.
As far as I know, your optimal air combo BnB/one that is universal to everyone who has a 2H that launches is:
2M
M
jump cancel
M
L (either a second L, or if their L is a multi hit like Gotenks just let it do all hits)
2H
Super Dash
(Depending on the character, you may need to delay this slightly)
L
L
2H
jump cancel
(Finishing it off depends on the character. Just try it out. If you have a level 1 that can pick up people off the ground, like Trunks Burning Attack, just do something like L,H, land, Burning Attack. If you have an air super, you can go for that: Gotenks can do L,M, 236M,214S, level 3.)
Obviously you can get fancier than that, but that'll work for the majority of the roster, and is more effective than 2M, M, jump cancel, L, M, jump cancel, L, M, 2H, super dash, L,L,M, whatever. That combo is good for ending with Vanish into dragon rush for the snapback though.