Anybody know how the flying time limits apply if you have two different flying jobs if one is 121 and one is 135? Could you legally fly 30 hours in a week for the 121 gig and then 4 more hours for the 135? Or 100 hours in a month for the 121 and another 20 for the 135? Thanks.

No. You cannot exceed the 100 hours per month under 121. 135 flying counts toward the 100 hour max…as does any commercial flying.

The way you stated it (the 121 flying coming first) then technically yes you could. Most 121 operations do not allow you (company policy) to do that because then you would be timed out for thier use for the holidays. Many would allow instructing or designated examiner flying as that isn't commercial flying and doesn't count against the 121 limits.

check again.... commercial flying (meaning compensation) absolutely DOES count... read a few of the license actions and NTSB reviews and you will see how bad the advice you just gave was.

I know of at least three DPEs who are actively employed lineholders at airlines.

But yes, commercial time is commercial time and it's at the discretion of your employer as to whether it's permitted on the side since it can interfere with their scheduling.

A recent FAA legal opinion re-affirmed the fact that compensated flight instruction does count against 135/121 flight time limits. Non-compensated instruction (ie teaching a family member) does not count.

Part 91 work should not create a duty-time conflict, but if you burn the candle at both ends you risk 91.13 for being fatigued.

As far as I know, all of the 121 operators in this country do not allow their pilots to fly commercially anywhere else. The only exception is being a DPE since DPEs are technically paid for examining, not flying. The DPE is not supposed to touch controls and log the time for that matter. Simply said, flying occurs incidentally during the exam and only the applicant logs the time during the checkride as a PIC. I'm not sure what part 135 is like but I assume similar restrictions. Once you are working for 121 airline you can't fly and be paid for it anywhere on the side, instructing included. Sorry for the bed news!

Depends on the airline and the circumstances. Some will let you with the DO's approval.

My company sums it up as "any flying that requires you to exercise the privileges of a commercial cert" is prohibited. Except in the case I gave above.

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Ok, well according to my ( granted soon to be defunct airline, Mesaba) instruction time (yes this is directily defined in the FOM) is NOT commercial time and not limited by the company. Also IF it were commercial time, it SHOULD require a 2nd class medical, also a point AOPA made to get it classified as its own type of operations.