Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.United’s long-haul aircraft are typically celebrated with far more fanfare, from delivery to retirement, but the carrier’s Boeing 737s operate more daily flights than all of UA’s wide-body planes combined. Today marks a major milestone when it comes to United’s short- and medium-haul flights, with delivery of the very first 737 MAX 9 from Boeing.I had a chance to check out the new aircraft ahead of its delivery. While not much has changed inside from the carrier’s latest 737-900ERs, the MAX 9 has an entirely new livery, plus a unique engine housing design.The carrier is expecting to add two more MAX 9s to its fleet this month, with a total of 10 planes flying by the end of the year. Although UA’s taking delivery of its first plane today, it won’t enter service until June 7, at which point it’ll operate the following flights:OriginDestinationDeparture TimeArrival TimeHouston (IAH)Orlando (MCO)7:35 am10:38 amHouston (IAH)Austin (AUS)10:25 am11:15 amHouston (IAH)Ft. Lauderdale (FLL)2:20 pm5:52 pmHouston (IAH)Anchorage (ANC)2:40 pm6:58 pmHouston (IAH)Orlando (MCO)2:50 pm6:19 pmHouston (IAH)San Diego (SAN)9:50 pm10:52 pmThen on June 29 the airline planes to add the MAX 9 to a handful of additional routes:OriginDestinationDeparture TimeArrival TimeHouston (IAH)Los Angeles (LAX)7:45 am9:23 amHouston (IAH)Tampa (TPA)7:50 am10:59 amHouston (IAH)Tampa (TPA)2:50 pm6:02 pmHouston (IAH)Los Angeles (LAX)9:35 pm10:59 pmHouston (IAH)Sacramento (SMF)9:50 pm11:27 pmLos Angeles (LAX)Houston (IAH)1:00 am6:14 amLos Angeles (LAX)Houston (IAH)8:15 am1:37 pmLos Angeles (LAX)Honolulu (HNL)11:05 am2:00 pmLater in the year, you can expect to find the MAX 9 on even more routes throughout North America, as United takes delivery of additional aircraft.For more on United’s 737 MAX, see:Exclusive Look Inside United’s Very First Boeing 737 MAXUnited Details First Boeing 737 MAX 9 RoutesUnited Places Order for 100 Boeing 737 MAX 10s