A couple of weeks ago, before I decided to go the travel agent route, I looked up all the airlines that service Cancun and went to each of their websites to sign up for event/group rates.

(image via here)
Below is a partial list of major airlines which fly out of the US that provide service to and from CUN aka Cancun, Mexico (there might have been a few that I overlooked). But the group information is not specific to flights to and from Cancun, it is applicable for all their flights. For a “complete” list of airlines that service Cancun from all over the world, go here.
For other destinations, a good place to start would be trying to Wikipedia the airport your guests will be flying into. Or, you can always go to your airport’s official website if they have one. From there, you can see the airlines that service that airport, narrow down which airlines to look for and then see if they offer group travel rates. It’s usually best to go to the airline’s official website because they have a form you can fill out about your group size and desired travel dates, and they contact you within a couple of days.
The links below bring you to the airline’s official group/event/wedding travel page and all information is taken directly from their official sites. Once again, this information is not Cancun specific and should be applicable to all the cities the airlines fly to. For complete information, visit the site! I am just posting the most relevant info.
AmericanAirlines Group & Meeting TravelSM has developed a unique wedding travel package that offers a 5% discount off the lowest applicable air fare, plus complimentary wedding invitation inserts to inform your out-of-town guests of the discount. These special discounts are available when 10 or more out-of-town guests travel to your wedding on American Airlines.
The Spirit Airlines Group Travel program offers one guaranteed price for all passengers traveling with the group. Group travel is not discounted travel. Group rates quoted are guaranteed for 24 hours.
Other benefits include:
Any group of 10 or more passengers traveling on the same itinerary can take advantage of the group program.
Groups of 10 or more passengers on the same flight itinerary qualify for special pricing from US Airways Group Travel. There are many benefits which are made available to passengers traveling in groups. These benefits include:
Group Size and Qualifications: 15 or more customers
All group customers must be booked on the same flight on the same day. Customers traveling separate from the group are considered individual bookings and regular fare rules and restrictions apply.
Whenever you are traveling with 10 or more people (including children), you can request Group Service in Aeromexico, and enjoy a variety of benefits.
Benefits
Check-in - You can check-in as a group, at a check-in counter dedicated to your party.
Meals - You can request special meals for your group, and also bring on board any food and drink items outside of our menu that you would like served to your party. Request these benefits at the time you make your reservation.
Tour Conductor - The tour conductor flies for free on groups of 30 or more passengers.
Discounts - Enjoy great savings; the more people in your group, the larger the discounts.
Special Services
For large groups, who take 80% or more of the aircraft seats, we offer exclusive benefits, like a welcome sign at the airport, special greeting in the plane, seat covers and more. Talk to your Aeromexico Groups executive to make the arrangements.
For groups of 10 or more passengers on the same flight, our Group and Specialty Sales Center will be glad to evaluate your request for blocked space using the following guidelines.
Minimum Requirement - 10 or more Coach/Economy passengers, or 8 or more Business/First Class passengers traveling together from the United States or Canada to Europe, Asia, Central and South America, Mexico, or the Caribbean.
Continental GroupWorks is standing by to meet your group’s travel needs. Groups of ten or more enjoy special pricing and special handling when traveling on Continental Airlines.
If you have ten or more people traveling on a common flight to a common destination, take advantage of a guaranteed fare and seats when traveling on Continental Airlines. With online bid requests, it is easy to obtain a GroupWorks quote for your group travel.
Not only will you save money by traveling on Continental Airlines, your group will be handled with care with these GroupWorks features:
Our competitive GroupsPlus product permits 10 or more passengers traveling on the same flight to the same destination to be eligible for United’s discounted group pricing.
Additionally, domestic itineraries are eligible to earn one free tour conductor ticket for every 30 ticketed passengers.
Features
For Domestic U.S. itineraries, we offer group pricing applicable on United, United Express, and/or Ted operated flights.
For International itineraries, we offer group pricing applicable on United in addition to our 16 Star Alliance carriers.
More sites: Northwest, Alaska Airways, Mexicana

Most of the airlines were pretty good about getting back to me fairly quickly. Happy planning!
Hopefully it won’t be too long until I see this lovely view again.
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