Personally, having seen how they operate, I'd vote no on any "improvement" that has a sunset clause (end date) that makes extension totally at their option.

Include a hard improvement like if the parties do not agree to revise & extend this LOA, then all FO regular rates shall permanently increase by 8% and all CA rates shall increase by 5% from current CBA rates. Additionally, if the company and union do not reach agreement on a revised reserve pilot CBA amendment by XX date, then the following modifications to the reserve rules shall take effect: (list changes).
Furthermore, henceforth the company shall make a 5% direct contribution to all CA 401k, and shall make an 8% direct contribution to all FO 401k. This shall be in addition to current 401k matching programs.
Pilots shall have the right to drop scheduled line flying so long as they do not go below 60 hours scheduled block for the month. Red & redder shall not apply to these trip drops. Trip trades of equal number of days on duty, or of trip values within 4 hours pay credit of eachother shall not be denied due to red/redder.
Health Insurance shall adjust the employee/employer prorations such that pilots shall pay no more than 18% of their costs calculated on an annual basis.
Company shall provide - at no cost to each pilot - both long term and short term disability insurance equal to no less than 70% of their salary.

Make their own inaction your weapon.

Don't just give them the ability to get beef in the seats for free.

Good luck guys; it's a great time to be a pilot. Make the most of it. Wanna really **** them off; tell em your hiring me as a contracted CBA negotiator. They can't fire me a fourth time, nothing to lose, and I'll tell em exactly where they can shove their bull**** offers. Right before I march over to the media about the abusive management at American's subsidiary.