I'm may be available vs I might be available

Some examples from the web:

• I'm afraid, Mrs. Harris, but the Eisenhower suite may not be available right now.
• All I'm saying is that that one there is beautiful on the inside as well and she's not going to be available forever.
• I'm sorry, but Dr. Connor has been called into surgery and he won't be available till the end of the day.
• Adequate lighting facilities shall be available.
• Detailed plans shall be available for emergency vaccination.
• Information concerning source, preparation date and stability should be available.
• PHARE funding continues to be available.
• The research findings must be available to all stakeholders.
• A more permanent scheme governance model should be available.
• Food, housing, medical care should always be available.
• So we think this provision should be available.
• Relevant information should be available on national websites.
• Integrated lifelong guidance systems should be available to all citizens.
• It should be available this month.
• Visual guidance must be available for navigation accuracy.
• Concessional funding should be available for mitigation and adaptation projects.
• Information on actual working hours must be available.
• The results should be available early 2004.
• Appropriate equipment shall be available for cleaning and disinfection.
• Standards must be available before chemical analysis is possible.

Some examples from the web:

• I might not be available, so I've given them your number.
• I might not be available then and, anyway, he needs help now.
• If you're here to invite me to the Lise Meitner dance, I might still be available.
• I heard you're hiring on men. Well, I might just be available.
• Adequate lighting facilities shall be available.
• Detailed plans shall be available for emergency vaccination.
• Information concerning source, preparation date and stability should be available.
• PHARE funding continues to be available.
• The research findings must be available to all stakeholders.
• A more permanent scheme governance model should be available.
• Food, housing, medical care should always be available.
• So we think this provision should be available.
• Relevant information should be available on national websites.
• Integrated lifelong guidance systems should be available to all citizens.
• It should be available this month.
• Visual guidance must be available for navigation accuracy.
• Concessional funding should be available for mitigation and adaptation projects.
• Information on actual working hours must be available.
• The results should be available early 2004.
• Appropriate equipment shall be available for cleaning and disinfection.