I have misgivings about an enemy looking at a radar signature, and not being able to be sure that it's a passenger airliner and not a bomber.
The range of the ALCM is 1500+ miles. Classifying everything inside that hemisphere as a 'target' would overwhelm air defense fire control.
As far as I know, there are NO SAMs with anything near a 1000 mile range.
The whole purpose of the "Cruise Missile Carrier" is to be able to launch a whole mob of ACLM while staying outside the range of enemy SAMs
Choose an airline which does not fly into a war zone. Here are a few sample Radar Cross Sections. Notice that the real nasty stuff is very, very small.
| Radar Cross Section (RCS) | ||
|---|---|---|
| RCS (m2) | RCS (dB) | |
| automobile | 100 | 20 |
| B-52 | 100 | |
| B-1(A/B) | 10 | |
| F-15 | 25 | |
| Su-27 | 15 | |
| cabin cruiser | 10 | 10 |
| Su-MKI | 4 | |
| Mig-21 | 3 | |
| F-16 | 5 | |
| F-16C | 1.2 | |
| man | 1 | 0 |
| F-18 | 1 | |
| Rafale | 1 | |
| Typhoon | 0.5 | |
| Tomahawk SLCM | 0.5 | |
| A-12/SR-71 | 0.01 (22 in2) | |
| bird | 0.01 | -20 |
| F-35 / JSF | 0.005 | -30 |
| F-117 | 0.003 | |
| insect | 0.001 | -30 |
| F-22 | 0.0001 | -40 |
| B-2 | 0.0001 | -40 |